A short route to new cyclobutene nucleoside analogues
摘要:
Nucleoside analogues (+)-4a and (+)-4b were obtained in non-racemic form by a short and efficient way. The key step was a Mitsunobu reaction of alcohol (-)-8 with adenine or protected thymine. The title products were obtained after deprotection steps. (C) 2002 Elsevier Science Ltd. All rights reserved.
The preparation and electrocyclic ring-opening of cyclobutenes: Stereocontrolled approaches to substituted conjugated dienes and trienes
作者:Falmai Binns、Roy Hayes、Kevin J. Hodgetts、Suthiweth T. Saengchantara、Timothy W. Wallace、Christopher J. Wallis
DOI:10.1016/0040-4020(96)00039-7
日期:1996.3
Thermal electrocyclic ring-opening of 4-alkyl-2-cyclobutene-1-carbaldehydes occurs at low temperature to give (2Z,4E)-alkadienals exclusively, and the process is exploited in transforming cis-3-cyclobutene-1,2-dimethanol 1 into a variety of naturally occurring 1,3,5-alkatrienes and 2,4-decadienoates. Desymmetrisation of 1 with Pseudomonas fluorescens lipase gives access to both enantiomers of 3-oxabicyclo[3
Use of cis-3-cyclobutene-1,2-dimethanol in stereoselective routes to some naturally occurring conjugated dienes and trienes
作者:Kevin J. Hodgetts、Suthiweth T. Saengchantara、Christopher J. Wallis、Timothy W. Wallace
DOI:10.1016/s0040-4039(00)73742-7
日期:1993.9
Thermal electronic ring-opening of 4-alkyl-2-cyclobutene-1-carbaldehydes occurs at low temperature to give (2Z,4E)-alka-2,4-dienals exclusively, and this process is exploited en route to various isomeric naturallyoccurring 1,3,5-alkatrienes and 2,4-decadienoates from a single precursor, cis-3-cyclobutene-1,2-dimethanol 4.
The total synthesis of the xenicane-type marine natural product isoxeniolide A has been accomplished through a ring-opening/ring-closingmetathesis sequence and an intramolecular Nozaki–Hiyama–Kishi (NHK) reaction to forge the nine-membered ring as the key enabling steps. The NHK cyclization was highly diastereoselective and provided the oxabicyclo[7.4.0]tridecene core of isoxeniolide A as a single
Xenicane型海洋天然产物isoxeniolide A的全合成是通过开环/闭环复分解序列和分子内Nozaki-Hiyama-Kishi (NHK)反应来完成的,以形成九元环作为关键脚步。 NHK 环化具有高度非对映选择性,并提供了异辛内酯 A 的氧杂双环[7.4.0]十三碳烯核心作为单一立体异构体。