Synthesis and Asymmetric Diels−Alder Reactions of Enantiopure 3-(Alkylsulfinyl)-1-methoxy-1,3-butadienes
作者:Maria C. Aversa、Anna Barattucci、Paola Bonaccorsi、Placido Giannetto、David Neville Jones
DOI:10.1021/jo962286p
日期:1997.6.1
Simple syntheses of enantiopure (E)- and (Z)-3-(alkylsulfinyl)-1-methoxy-1,3-butadienes 2and 3 were provided by the addition of (1S)-isoborneol-10-sulfenic and (S)-phenyl-2-hydroxyethanesulfenic acids 8 to (E)- and (Z)-1-methoxybut-1-en-3-ynes (9) and (10). These additions proceeded with asymmetric induction, the extent of which depended upon the nature of the chiral hydroxyalkyl group. Cycloadditions
对映纯(E)-和(Z)-3-(烷基亚磺酰基)-1-甲氧基-1,3-丁二烯2和3的简单合成通过添加(1S)-异冰片醇-10-亚磺酰基和(S)-苯基-2-羟基乙烷亚磺酸8至(E)-和(Z)-1-甲氧基但是-1-en-3-炔基(9)和(10)。这些添加以不对称诱导进行,其程度取决于手性羟烷基的性质。当高氯酸锂或氯化锌在二氯甲烷中催化时,丙烯酸甲酯向对映体纯二烯的环加成反应具有完全的区域选择性和非常高的立体选择性。硫的手性控制了这些Diels-Alder环加成物中的非对映选择性。