NBS-mediated cyclization of trans-cinnamic alcohols
作者:Meng-Yang Chang、Chung-Yu Tsai、Ming-Hao Wu
DOI:10.1016/j.tet.2013.05.110
日期:2013.8
An efficient and straightforward three-step synthetic route toward 2,4-disubstituted-3-bromooxetanes 5 with the trans–trans contiguous stereogenic centers is developed from functionalized chalcones 3 via NaBH4-mediated reduction of chalcones 3, followed by NBS-mediated electrophilic cyclization of the resulting trans-cinnamic alcohols 4 in good yield. Skeleton 3 is prepared by Claisen–Schmidt condensation