Elaboration of 1-benzoyltetrahydroisoquinoline derivatives employing a Pictet–Spengler cyclization with α-chloro-α-phenylthioketones. Synthesis of O-methylvelucryptine
作者:Claudio C Silveira、Carmem R Bernardi、Antonio L Braga、Teodoro S Kaufman
DOI:10.1016/s0040-4039(01)01998-0
日期:2001.12
N-tosyl-β-phenethylamines with α-chloro-α-phenylthioketones, leading to 1-benzoyl- and 1-pivaloyl-tetrahydroisoquinolines under modified Pictet–Spengler conditions, is described. The synthesis of O-methylvelucryptine employing this transformation as a key step is reported.
Pictet-Spengler condensation of N-sulfonyl-β-phenethylamines with α-chloro-α-phenylselenoesters. New synthesis of 1,2,3,4-tetrahydroisoquinoline-1-carboxylates
作者:Claudio C. Silveira、Carmem R. Bernardi、Antonio L. Braga、Teodoro S. Kaufman
DOI:10.1016/s0040-4039(99)00958-2
日期:1999.7
The reaction of N-sulfonyl-β-phenethylamines with α-chloro-α-phenylseleno acetate/propionate esters under Lewis acid promotion gives moderate to good yields of the corresponding 1,2,3,4-tetrahydroisoquinoline-1-carboxylates. Varying degrees of diastereoselection were obtained using chiral sulfonamides and/or esters. Employing this strategy, the achievement of a new total synthesis of Calycotomine is
Route to Functionalized Tetrahydrobenzo[<i>d</i>]azepines via Re<sub>2</sub>O<sub>7</sub>-Mediated Intramolecular Friedel–Crafts Reaction
作者:Yuzhu Zheng、Qing Huang、Xiong Fang、Youwei Xie
DOI:10.1021/acs.joc.3c01977
日期:2024.2.2
We describe a Re2O7-mediated intramolecular dehydrative Friedel–Crafts reaction for the efficient synthesis of various benzo-fused heterocycles such as benzazepines and benzazocines. This process is characterized by a broad substrate scope, mild reaction conditions, high efficiency, and high atom economy. The potential application of this methodology was exemplified by the facile preparation of a NMDA
我们描述了 Re 2 O 7介导的分子内脱水弗里德尔-克来福特反应,用于有效合成各种苯并稠合杂环化合物,例如苯并氮杂卓和苯并佐辛。该工艺具有底物范围广、反应条件温和、效率高、原子经济性高等特点。 NMDA 拮抗剂以及 SKF 38393 过程中的关键中间体的轻松制备证明了该方法的潜在应用。
Thioorthoesters in the activated Pictet–Spengler cyclization. Synthesis of 1-thiosubstituted tetrahydroisoquinolines and carboncarbon bond formation via sulfonyl iminium ions generated from N,S-sulfonyl acetals
作者:Claudio C Silveira、Carmem R Bernardi、Antonio L Braga、Teodoro S Kaufman
DOI:10.1016/s0040-4039(03)01452-7
日期:2003.8
The elaboration of 1-alkylthio- and 1-arylthio-tetrahydroisoquinolines by means of the activated Pictet-Spengler reaction of N-sulfonyl-beta-phenethylamines with thioorthoesters as electrophiles, and their use as sulfonyl iminium ion precursors for carbon-carbon bond formation, leading to 1-substituted tetrahydroisoquinoline derivatives, is reported. (C) 2003 Elsevier Ltd. All rights reserved.