Allyl Transfer to Aldehydes and Ketones by Brønsted Acid Activation of Allyl and Crotyl 1,3,2-Dioxazaborolidines
作者:Maureen K. Reilly、Scott D. Rychnovsky
DOI:10.1021/ol1020515
日期:2010.11.5
Brønsted acids activate allyl dioxazaborolidines to generate reactive allyl-transfer reagents in situ. These reagents add to aldehydes and ketones to generate the corresponding alcohols in good yields under mild conditions. The E- and Z-crotyl reagents react diastereoselectively with aldehydes and ketones to produce anti and syn adducts, respectively, a result consistent with a cyclic transition state (type
烷基二恶唑硼烷是空气稳定的,通常是结晶有机硼烷。多种 Brønsted 酸激活烯丙基二恶唑硼烷以原位生成反应性烯丙基转移试剂。这些试剂添加到醛和酮中,在温和的条件下以良好的收率生成相应的醇。的ë -和Ž -crotyl试剂与醛和酮非对映选择性反应以产生抗与顺式加合物,分别与环状过渡态(I型机构)相一致的结果。