Benzyne Click Chemistry: Synthesis of Benzotriazoles from Benzynes and Azides
作者:Feng Shi、Jesse P. Waldo、Yu Chen、Richard C. Larock
DOI:10.1021/ol800675u
日期:2008.6.1
A variety of substituted benzotriazoles have been prepared by the [3 + 2] cycloaddition of azides to benzynes. The reaction scope is quite general, affording a rapid and easy entry to substituted, functionalized benzotriazoles under mild conditions.
N-(3-Benzo[b]thienyl)- and N-(2-benzo[b]thienyl)-imino-triphenylphosphorane—prepared from the corresponding azidobenzo[b]thiophenes—react with α,β-unsaturated aldehydes under mild conditions to give directly benzo-[b]thieno[3,2-b]- and benzo[b]thieno[2,3-b]-pyridines through electrocyclization (and eventual dehydrogenation) of the initial aza Wittig imine products.
N-(3-Benzo[b]thienyl)iminophosphoranes toward the Synthesis of Benzo[b]thieno[3,2-b]pyridines: Reactivity and Alternative Regioselectivity with α,β-unsaturated Ketones and Aldehydes
es 1b–d react with α,β-unsaturated aldehydes and ketones 2a–e to give varying mixtures of the regioisomeric benzothieno[3,2-b]pyridines 3a–d and 4a–d as a result of preferential attack of either imino nitrogen or α-thienyl carbon at the enone carbonyl group. The findings indicate that the progressive replacement of phenyl with methyl P-substituent greatly enhances the reactivity of the phosphorane
新的N-(3-苯并[ b ]噻吩基)亚氨基正膦酸酯1b - d与α,β-不饱和醛和酮2a - e反应,生成区域异构的苯并噻吩并[3,2- b ]吡啶3a - d和亚氨基氮或α-噻吩基羧酸在烯酮的羰基上优先进攻的结果是在图4a - d中。该发现表明,用甲基P-取代基逐步取代苯基大大增强了磷烷1的反应性。 并同时提高了磷烷本身通过α-噻吩基碳添加到烯酮中的倾向。
Funicello, Maria; Spagnolo, Piero; Zanirato, Paolo, Journal of the Chemical Society. Perkin transactions I, 1990, # 11, p. 2971 - 2978
作者:Funicello, Maria、Spagnolo, Piero、Zanirato, Paolo
DOI:——
日期:——
Zanirato, Paolo, Journal of the Chemical Society. Perkin transactions I, 1991, p. 2789 - 2796