Reactions of Lithiated Alkynes and Allenes with Isothiocyanates: A Simple and Efficient Synthesis of New Aryl- or Hetaryl-Substituted 3H-Azepines and 4,5-Dihydro-3H-azepines
作者:Nina Nedolya、Boris Trofimov、Ol’ga Tarasova、Ol’ga Volostnykh、Alexander Albanov、Ludmila Klyba
DOI:10.1055/s-0030-1260084
日期:2011.7
aryl, hetaryl, alkyl, and heteroalkyl substituents from readily accessible starting materials (aryl- and hetaryl-substituted alkynes or allenes, sec-alkyl isothiocyanates, and alkyl halides) has been developed. The methodology is based on a fast and smooth conversion of conjugated 2-aza-1,3,5-trienes derived from 1-aza-1,3,4-trienes, S-alkylated adducts of isopropyl isothiocyanate and allenic or acetylenic
一种新颖的合成方法,可从易于获得的起始原料(经芳基和杂芳基取代)制备各种带有各种芳基,杂芳基,烷基和杂烷基取代基的3 H-氮杂和4,5-二氢-3 H-氮杂已开发出炔烃或炔烃,异硫氰酸仲烷基酯和卤代烷烃。该方法基于快速平稳地转化衍生自1-氮杂-1,3,4-三烯的共轭2-氮杂-1,3,5-三烯,异硫氰酸异丙基酯的S-烷基化加合物和烯丙基或炔属碳负离子,用叔碳酸钾将其分成七元氮杂杂环,3 H-氮杂和4,5-二氢-3 H-杂氮-丁氧化物(THF-DMSO,约-30°C,30分钟)。杂环的比例取决于丙二烯或炔上的取代基的性质以及由其衍生的2-氮杂-1,3,5-三烯的取代基的性质。 3 H-氮杂卓-4,5-二氢-3 H-氮杂卓-氮杂三烯-丙二烯-炔烃-异硫氰酸酯-金属化-电环化