Aziridine-2-carboxylates were prepared from the reaction of hexahydro-1,3,5-triazines with alkyldiazoacetates in the presence of Lewis acid catalyst in high yield.
在路易斯酸催化剂存在下,由六氢-1,3,5-三嗪与烷基重氮乙酸酯反应制备氮丙啶-2-羧酸酯。
Synthesis of (<i>S</i>)-(−)-Cucurbitine and Conformation of Its Homopeptides
A chiral cyclic α,α-disubstituted α-amino acid, (S)-(−)-cucurbitine, which has a pyrrolidine ring with a chiral center at the α-position, was synthesized, and its homopeptides were prepared. (S)-(−)-Cucurbitine homopeptides with a Boc-protecting group formed helical structures with slight control of the helicalscrewsense to the left-handed form. The state of the pyrrolidine ring in (S)-(−)-cucurbitine
合成了手性环状α,α-二取代α-氨基酸( S )-(-)-葫芦素,其具有在α-位具有手性中心的吡咯烷环,并制备了其同肽。( S )-(-)-带有 Boc 保护基团的葫芦素同肽形成螺旋结构,稍微控制左旋形式的螺旋螺旋感。( S )-(-)-葫芦素中吡咯烷环的状态对于控制其同肽的螺旋结构和螺旋螺旋意义很重要。
A concise and novelsynthesis of isoquinoline alkaloids (S)-latifine and of its antipode is reported. The key step relies on the stereoselective reduction of an appropriately substituted diarylenamine equipped with a chiral auxiliary followed by Pictet–Spengler cyclization to generate the tetrahydroisoquinoline unit.
enantiomerically pure 1-(1-phenylethyl)-1H-imidazole 3-oxide 7 in high yield (Schemes 2 and 3). The reactions are carried out either in MeOH or in AcOH. Smooth transformations of the N-oxides into opticallyactive 1-(1-phenylethyl)-1H-imidazoles 10 and 2,3-dihydro-1-(1-phenylethyl)-1H-imidazole-2-thiones 11 are achieved by treatment of 7 with Raney-Ni and 2,2,4,4-tetramethyl-3-thioxocyclobutanone (12),
A new synthesis of aziridine-2-carboxylates: Reaction of hexahydro-1,3,5-triazines or N-methoxymethylanilines with alkyl diazoacetates in the presence of lewis acid
作者:Hyun-Joon Ha、Jang-Min Suh、Kyung-Ho Kang、Young-Gil Ahn、Oksoo Han
DOI:10.1016/s0040-4020(97)10358-1
日期:1998.1
Aziridine-2-carboxylates were prepared from the reaction of hexahydro-1,3,5-triazines or N-methoxymethylanilines with alkyl diazoacetates in the presence of Lewis acid catalyst in high yield. (C) 1997 Elsevier Science Ltd. All rights reserved.