β-Carboline which was protected at N-9 by an acyl group derived from L-pyroglutamic acid reacted with allyltributyltin or silyl enol ethers in the presence of an alkyl chloroformate in a highly diastereoselective manner to give 1-substituted 1,2-dihydro-β-carbolines. The compounds were readily transformed to the corresponding asymmetric 1-substituted tetrahydro-β-carbolines that are common partial
在 N-9 位被
L-焦谷氨酸衍生的酰基保护的 β-咔啉在
氯甲酸烷基酯存在下以高度非对映选择性的方式与
烯丙基三丁基锡或甲
硅烷基烯醇醚反应,得到 1-取代的 1,2-二氢- β-咔啉。这些化合物很容易转化为相应的不对称 1-取代四氢-β-咔啉,这是各种
吲哚生物碱中常见的部分结构。