作者:Day-Shin Hsu、Shih-Chung Lin
DOI:10.1021/jo300923e
日期:2012.7.20
The first enantioselective syntheses of cladoacetals A (1a, overall yield: 16%) and B (1b, overall yield: 34%) from crotonaldehyde in nine and seven steps, respectively, have been accomplished. Sharpless asymmetric dihydroxylation, Suzuki coupling, and acid-catalyzed intramolecular acetalization were the key steps in the syntheses. The absolute configuration of natural (+)-cladoacetal A was affirmed
已分别从巴豆醛分九步和七个步骤完成了对缩醛A(1a,总产率:16%)和B(1b,总产率:34%)的首次对映选择性合成。尖锐的不对称二羟基化,Suzuki偶联和酸催化的分子内缩醛化是合成的关键步骤。天然的(+)的绝对构型- cladoacetal A被确认为1小号,3小号,4 - [R ,而该的( - ) - cladoacetal B在确认为1 - [R,3小号,4小号。