作者:Alessandro Gambaro、Daniele Marton、Valerio Peruzzo、Giuseppe Tagliavini
DOI:10.1016/s0022-328x(00)87430-6
日期:1982.2
obtained from the equilibrated mixtures obtained by redistribution between Bu3SnC4H7 (C4H7 = trans-, cis-crotyl and α-methylallyl group) and Bu2SnCl2. The reactions are characterized by a high degree of stereoselectivity, especially when bulky R groups are present. The complete allylic rearrangement and the stereoselectivity indicate that an exacyclic transition state is involved. Two stereochemically different
2-丁烯基-氯-二-正丁基锡,以不同的反式/顺式比例与纯净的RCHO(R = CH 3,C 2 H 5,C 2 H 5(CH 3)CH,(CH 3)2 CH,C 6 H 5)在25℃下以高收率得到苏/赤-α-甲基烯丙基碳氢化合物的混合物。从通过在Bu 3 SnC 4 H 7(C 4 H 7 =反式,顺式)之间重新分布而获得的平衡混合物中获得了相同的混合物。-巴豆基和α-甲基烯丙基)和Bu 2 SnCl 2。该反应的特征在于高度的立体选择性,特别是当存在庞大的R基团时。完全的烯丙基重排和立体选择性表明涉及环外过渡态。两个立体化学上不同的过渡态分别导致两个非对映异构体,即对映体RS,SR和RR,SS中的苏-和邻-α-甲基-烯丙基甲醇。