{"id":10314,"date":"2022-10-20T02:41:59","date_gmt":"2022-10-19T18:41:59","guid":{"rendered":"https:\/\/www.pyrazoles-derivatives.com\/?p=10314"},"modified":"2022-10-20T02:41:59","modified_gmt":"2022-10-19T18:41:59","slug":"browne-duncan-ls-team-published-research-in-journal-of-the-american-chemical-society-in-2009-06-10-1002334-12-4-2","status":"publish","type":"post","link":"https:\/\/www.pyrazoles-derivatives.com\/?p=10314","title":{"rendered":"Browne, Duncan L’s team published research in Journal of the American Chemical Society in 2009-06-10 | 1002334-12-4"},"content":{"rendered":"

Browne, Duncan L.; Vivat, Jerome F.; Plant, Andrew; Gomez-Bengoa, Enrique; Harrity, Joseph P. A. published the artcile< Investigation of the scope and regiochemistry of alkynylboronate cycloadditions with sydnones>, Recommanded Product: 1-Phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole<\/a>, the main research area is sydnone alkynylboronate cycloaddition regioselective pyrazole boronate preparation; pyrazole boronate dioxaborolanyl preparation regioselective cycloaddition sydnone alkyne alkynylboronate; boronate pyrazolyl substituted preparation cycloaddition alkynylboronate; transition state structure regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; potential energy surface regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; optimized geometry sydnone alkynylboronate cycloaddition intermediate pyrazole transition state.<\/p>\n

Di-, tri-, and tetrasubstituted 3- and 4-pyrazolylboronates were prepared by a convenient and highly regioselective procedure comprising cycloaddition of alkynylboronates to sydnones. Addition of 3-R1-4-R2-5-oxy-1,2,3-oxadiazolium with 2-alkynyl-4,4,5,5-tetramethyl-1,3,2-dioxaborolanes R3C\ue306CB(OCMe2)2 in 1,2-dichlorobenzene at 180\u00b0 gave 1-R1-3-R3-4-X-5-R2-1H-pyrazoles (20a-30a; X = 4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl; R1 = Ph, Me, 4-NO2C6H4; R2 = Ph, Me, iPr; R3 = Ph, Me3Si); the corresponding regioisomers, 1-R1-4-R3-3-X-5-R2-1H-pyrazoles, were formed in less than 2% amounts However, regioselectivity (a:b) of the reaction of 3-Ph-5-oxy-1,2,3-oxadiazolium with R4C\ue306CB(OCMe2)2 giving 1-R1-3-R4-4-X- and 1-R1-4-R4-3-X-1H-pyrazoles (8a-13a, 8b-13b, resp., R1 = Ph, Me, PhCH2, R4 = H, Bu, Me3Si) was lower (1:7, 5:2 and 2:1, resp.). The origins of an observed regiochem. divergence in the reactions of terminal alkynylboronates with their more substituted analogs have been studied by DFT methods.<\/p>\n

Journal of the American Chemical Society published new progress about [3+2] Cycloaddition reaction. 1002334-12-4 belongs to class pyrazoles-derivatives, and the molecular formula is C15H19BN2O2, Recommanded Product: 1-Phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole<\/a>.<\/p>\n

Referemce:
Pyrazole – Wikipedia<\/a>,
Pyrazoles – an overview | ScienceDirect Topics<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Journal of the American Chemical Society published new progress about [3+2] Cycloaddition reaction. 1002334-12-4 belongs to class pyrazoles-derivatives, and the molecular formula is C15H19BN2O2, Recommanded Product: 1-Phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole<\/a>.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[739,131],"tags":[740],"class_list":["post-10314","post","type-post","status-publish","format-standard","hentry","category-1002334-12-4","category-pyrazoles-derivatives","tag-m-w250-300"],"yoast_head":"\nBrowne, Duncan L's team published research in Journal of the American Chemical Society in 2009-06-10 | 1002334-12-4 | pyrazoles-derivatives<\/title>\n<meta name=\"description\" content=\"Browne, Duncan L.; Vivat, Jerome F.; Plant, Andrew; Gomez-Bengoa, Enrique; Harrity, Joseph P. A. published the artcile< Investigation of the scope and regiochemistry of alkynylboronate cycloadditions with sydnones>, Recommanded Product: 1-Phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole, the main research area is sydnone alkynylboronate cycloaddition regioselective pyrazole boronate preparation; pyrazole boronate dioxaborolanyl preparation regioselective cycloaddition sydnone alkyne alkynylboronate; boronate pyrazolyl substituted preparation cycloaddition alkynylboronate; transition state structure regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; potential energy surface regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; optimized geometry sydnone alkynylboronate cycloaddition intermediate pyrazole transition state.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pyrazoles-derivatives.com\/?p=10314\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Browne, Duncan L's team published research in Journal of the American Chemical Society in 2009-06-10 | 1002334-12-4 | pyrazoles-derivatives\" \/>\n<meta property=\"og:description\" content=\"Browne, Duncan L.; Vivat, Jerome F.; Plant, Andrew; Gomez-Bengoa, Enrique; Harrity, Joseph P. A. published the artcile< Investigation of the scope and regiochemistry of alkynylboronate cycloadditions with sydnones>, Recommanded Product: 1-Phenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole, the main research area is sydnone alkynylboronate cycloaddition regioselective pyrazole boronate preparation; pyrazole boronate dioxaborolanyl preparation regioselective cycloaddition sydnone alkyne alkynylboronate; boronate pyrazolyl substituted preparation cycloaddition alkynylboronate; transition state structure regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; potential energy surface regioselectivity cycloaddition alkynylboronate sydnone preparation pyrazolylboronate; optimized geometry sydnone alkynylboronate cycloaddition intermediate pyrazole transition state.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.pyrazoles-derivatives.com\/?p=10314\" \/>\n<meta property=\"og:site_name\" content=\"pyrazoles-derivatives\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-19T18:41:59+00:00\" \/>\n<meta name=\"author\" content=\"Jessica.F\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jessica.F\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.pyrazoles-derivatives.com\/?p=10314\",\"url\":\"https:\/\/www.pyrazoles-derivatives.com\/?p=10314\",\"name\":\"Browne, Duncan L's team published research in Journal of the American Chemical Society in 2009-06-10 | 1002334-12-4 | pyrazoles-derivatives\",\"isPartOf\":{\"@id\":\"http:\/\/www.pyrazoles-derivatives.com\/#website\"},\"datePublished\":\"2022-10-19T18:41:59+00:00\",\"author\":{\"@id\":\"http:\/\/www.pyrazoles-derivatives.com\/#\/schema\/person\/d9a9f27bed675392c6f363a01ffd49f1\"},\"description\":\"Browne, Duncan L.; Vivat, Jerome F.; Plant, Andrew; Gomez-Bengoa, Enrique; Harrity, Joseph P. 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