Biocatalytic syntheses of chiral non-racemic 2-hydroxyalkanephosphonates
摘要:
A series of 2-oxoalkanephosphonates 2 were screened for reduction with Geotrichum candidum. Only diethyl 2-oxopropanephosphonate 2a underwent asymmetric reduction to give (+)-(R)-diethyl 2-hydroxypropanephosphonate 3a with 98% e.e. In turn, a series of racemic 2-hydroxyalkanephosphonates 3 were acetylated under kinetic resolution conditions in the presence of various lipases to give the corresponding 2-acetoxyalkanephosphonates 4 and recovered alcohols 3 in good yields and with e.e. up to 93%. (C) 2002 Elsevier Science Ltd. All rights reserved.
Enantio- and Stereospecific Syntheses of 15(<i>R</i>)-Me-PGD<sub>2</sub>, A Potent and Selective DP<sub>2</sub>−Receptor Agonist
作者:Pranav Patel、Gue-Jae Lee、Seongjin Kim、Gail E. Grant、William S. Powell、Joshua Rokach
DOI:10.1021/jo801190m
日期:2008.9.19
The first total synthesis of 15(R)-Me-PGD2 3 is reported. The synthesis is based on the enantioselective and stereospecific syntheses of synthon 17 and its attachment to the five-membered ring by a olefin cross metathesis reaction. This approach permits the introduction of a side chain with a predetermined stereogenic center into the prostanoid ring, resulting in the synthesis of 15R-methyl prostaglandin
Total synthesis of (+)-Indolizidine 195 B and (+)-Monomorine
作者:Guy Solladié、Guo-Hua Chu
DOI:10.1016/0040-4039(95)02086-1
日期:1996.1
The total synthesis of (+)-Indolizidine 195 B and (+)-Monomorine is described. The formation of the chiral centers was stereocontrolled by chiral sulfoxides.
描述了(+)-吲哚并立定195 B和(+)-莫诺林的总合成。手性中心的形成是由手性亚砜立体控制的。
Catechol derivatives and pharmaceutical compositions thereof for
申请人:Yamanouchi Pharmaceutical Co., Ltd.
公开号:US04618627A1
公开(公告)日:1986-10-21
A catechol derivative represented by the formula ##STR1## The compounds of this invention are useful for the prophylaxis and treatment for various allergic diseases, ischemic heart diseases and inflammations caused by slow reacting substance of anaphylaxis (SRS-A), since the compounds inhibit very potently the formation and release of SRS-A.
Divergent Total Synthesis of the Tricyclic Marine Alkaloids Lepadiformine, Fasicularin, and Isomers of Polycitorols by Reagent-Controlled Diastereoselective Reductive Amination
作者:Jinkyung In、Seokwoo Lee、Yongseok Kwon、Sanghee Kim
DOI:10.1002/chem.201404316
日期:2014.12.22
We describe a flexible and divergent route to the pyrrolo‐/pyrido[1,2‐j]quinoline frameworks of tricyclic marine alkaloids via a common intermediate formed by the ester–enolate Claisen rearrangement of a cyclic amino acid allylic ester. We have synthesized the proposed structure of polycitorols and demonstrated that the structure of these alkaloids requires revision. In addition to asymmetric formal
The invention refers to conjugated secondary alkatrienol derivatives, a method of their production and to flavour and perfume compositions comprising them.