A Convenient New Route to Piperidines, Pyrrolizidines, Indolizidines, and Quinolizidines by Cyclization of Acetylenic Sulfones with β- and γ-Chloroamines. Enantioselective Total Synthesis of Indolizidines <b>(</b><b>−</b><b>)-167B</b>, <b>(</b><b>−</b><b>)-209D</b>, <b>(</b><b>−</b><b>)-209B</b>, and <b>(</b><b>−</b><b>)-207A</b>
作者:Thomas G. Back、Katsumasa Nakajima
DOI:10.1021/jo000080p
日期:2000.7.1
the corresponding 2- or 2,6-disubstituted piperidines, while 2-(chloromethyl)pyrrolidines, 2-(2-chloroethyl)pyrrolidines, 2-(chloromethyl)piperidines, and 2-(2-chloroethyl)piperidines produced the corresponding 3-substituted pyrrolizidines, 5- or 3-substituted indolizidines, and 4-substituted quinolizidines, respectively. 8-Methyl-5-substituted indolizidines were also prepared from the appropriate methyl-substituted
(L)-苯丙氨酸和(L)-蛋氨酸的甲酯通过其游离氨基与1-(对甲苯磺酰基)己炔进行共轭加成反应,随后将相应的酰胺阴离子进行分子内酰化和互变异构化,得到2-苄基- 5-正丁基-3-羟基-4-(对甲苯磺酰基)吡咯和5-正丁基-3-羟基-2-(2-甲硫基乙基)-4-(对甲苯磺酰基)吡咯。一系列无环和环状仲β-和γ-氯胺在炔属砜上的共轭加成在温和的条件下类似地进行。将所得的加合物在-78℃下用LDA在THF中的去质子化,并将所得的砜稳定的碳负离子进行分子内烷基化,得到环状烯胺砜。因此,无环的γ-氯烷基-苄胺提供了相应的2-或2,6-二取代的哌啶,而2-(氯甲基)吡咯烷,2-(2-氯乙基)吡咯烷,2-(氯甲基)哌啶和2-(2-氯乙基)哌啶产生相应的3-取代的吡咯烷,5-或3 -取代的吲哚嗪和4-取代的喹oli啶。还由适当的甲基取代的氯胺前体制备8-甲基-5-取代的吲哚并核苷。对映选择性合成是通过使用