Synthesis of 2-iminothiazoline derivatives by sequential conjugate addition/annulation/ring-opening reactions
作者:Antonio Arcadi、Orazio A. Attanasi、Gianluca Giorgi、Paolino Filippone、Elisabetta Rossi、Stefania Santeusanio
DOI:10.1016/j.tetlet.2003.09.123
日期:2003.11
reacted with rhodanine affording 2-(mercaptoacetyl)iminothiazoline derivatives through conjugate addition/annulation/ring-opening/oxidative dimerization. The hypothesized ring-closure and ring-opening mechanism was supported by X-raycrystalstructure analysis of a compound obtained by reaction of the same reagents with a chiral 1,3-oxazolidine-2-thione derivative.
Reactionsbetween chiral 3-cinnamoyl-4-methyl-5-phenyl-1,3-oxazolidine-2-thiones and aromatic aldehydes in the presence of BF3Et2O diastereoselectively produced tricyclic compounds incorporating a bridgehead carbon bound to four heteroatoms in high yields. Four stereocenters were induced during the reaction. The tricyclic products were transformed into propane-1,3-diols bearing three consecutive stereocenters
在BF 3 Et 2 O非对映选择性地存在下,手性3-肉桂酰基-4-甲基-5-苯基-1,3-恶唑烷-2-硫酮与芳族醛之间的反应以高收率选择性地结合了桥键碳与四个杂原子结合的三环化合物。在反应过程中诱导了四个立体中心。通过酸水解,S-甲基化和手性助剂的还原去除,将三环产物转化为带有三个连续立体中心的丙烷-1,3-二醇。
Synthesis of chiral sulfines by oxidation of dithio esters
作者:Johannes B. van der Linden、Johan L. Timmermans、Binne Zwanenburg
DOI:10.1002/recl.19951140304
日期:——
The synthesis of sulfines (thione oxides) (2, 10 and 17) derived from three chiraldithioesters (1, 8 and 16) bearing a hydrogen at the α-carbon atom is described. The sulfine bearing an amido group at C-α (2), does not racemize and proved to be stable over a long period. When C-α in the sulfine (10) bears an acetoxy group the optical activity remained unchanged for a period of two months; after longer
Moreno-Manas, Marcial; Padros, Imma, Journal of Heterocyclic Chemistry, 1993, vol. 30, # 5, p. 1235 - 1240
作者:Moreno-Manas, Marcial、Padros, Imma
DOI:——
日期:——
Stereocontrolled synthesis of novel phytosphingosine-type glucosaminocerebrosides
作者:Teiichi Murakami、Kazuhiro Taguchi
DOI:10.1016/s0040-4020(98)01104-1
日期:1999.1
D-ribo-Phytosphingosine 1 was conveniently synthesized from N-benzoyl-D-glucosamine 3 by an improved route in which regioselective O-methanesulfonation and diastereoselective Grignard addition are involved as key steps. Using a synthetic intermediate of 1, novel D-ribo-phytosphingosinetype glycolipids 2a and 2b, unnatural homologues of antifungal cerebrosides Halicylindrosides, were efficiently synthesized in a stereocontrolled manner. (C) 1999 Elsevier Science Ltd. All rights reserved.