A series of dialkyl 2-methylidene tetrahydrothiophene-3,3-dicarboxylates was prepared from (tert-butyl)iso-propyl thioketene via Lewis acid catalyzed (3+2)-cycloaddition with D-A cyclopropanes. In all studied cases the (Z)-diastereoisomer was found as the main product.
以(叔丁基)异丙基
硫烯酮为原料,通过
路易斯酸催化与
DA环丙烷的(3+2)环加成反应制备了一系列2-亚甲基
四氢噻吩-3,3-二
羧酸二烷基酯。在所有研究案例中,( Z )-非对映异构体被发现是主要产物。