isocyanate; ClSO2NCO) led to the tricyclic lactams 6 and 8 corresponding to the initial formation both of the tertiary carbenium and α-cyclopropylcarbenium ions (Scheme 2). A number of optically active derivatives of β-amino acids which are promising compounds for further use in asymmetric synthesis were synthesized from the lactams (see 16, 17, and 19–21 in Scheme 3).
(+)-car-2-ene(4)与
氯磺酰基
异氰酸酯(=
磺酰氯异氰酸酯; ClSO 2 NCO)反应生成
三环内酰胺6和8,分别对应于叔碳car和α-环丙基碳carb的初始形成。离子(方案2)。若干光学活性衍
生物的β -
氨基酸,其是有希望用于进一步使用在不对称合成中是从内酰胺合成的化合物(参见16,17,和19 - 21在方案3)。