Stereoselective synthesis of N-benzyl (2S,3S,4S)-3-hydroxy-4-methylproline
摘要:
The synthesis of (2S,3S,4S)-N-benzyl-3-hydroxy 4-methyl proline and its stereoisomer (2R,3R,4S)-N-benzyl-3-hydroxy 4-methyl proline has been achieved starting with the conjugate addition of methyl methacrolate and benzylamine. The other key reactions performed in our strategy include enzymatic separation of an alpha-methyl beta-amino alcohol, Sharpless asymmetric dihydroxylation of an alpha,beta-unsaturated delta-amino ester, and intramolecular cyclization of a sulfonate to a pyrrolidine ring system. Two stereoisomers were synthesized from the common alpha,beta-unsaturated delta-amino ester intermediate. This protocol is simple, straightforward, efficient, highly stereoselective, and economically viable. (C) 2016 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of N-benzyl (2S,3S,4S)-3-hydroxy-4-methylproline
摘要:
The synthesis of (2S,3S,4S)-N-benzyl-3-hydroxy 4-methyl proline and its stereoisomer (2R,3R,4S)-N-benzyl-3-hydroxy 4-methyl proline has been achieved starting with the conjugate addition of methyl methacrolate and benzylamine. The other key reactions performed in our strategy include enzymatic separation of an alpha-methyl beta-amino alcohol, Sharpless asymmetric dihydroxylation of an alpha,beta-unsaturated delta-amino ester, and intramolecular cyclization of a sulfonate to a pyrrolidine ring system. Two stereoisomers were synthesized from the common alpha,beta-unsaturated delta-amino ester intermediate. This protocol is simple, straightforward, efficient, highly stereoselective, and economically viable. (C) 2016 Elsevier Ltd. All rights reserved.
Novel transformation of α,β-unsaturated aldehydes and ketones into γ-amino alcohols or 1,3-oxazines via a 4 or 5 step, one-pot sequence
作者:Adam D. J. Calow、Andrei S. Batsanov、Elena Fernández、Cristina Solé、Andrew Whiting
DOI:10.1039/c2cc36129a
日期:——
An efficient, 4-step, one-pot, highly stereoselective route to γ-amino alcohols has been developed via an in situ α,β-unsaturated imine formation, β-boration, reduction (CN) and oxidation (CâB) sequence and especially for certain water-soluble γ-amino alcohols, a further step can be added to directly access the corresponding 1,3-oxazine derivatives.
A compound represented by the formula:
1
wherein ring M is a heterocyclic ring wherein
—X═Y<
is one of —N═C<, —CO—N< or —CS—N<;
R
a
and R
b
are bonded to each other to form Ring A, or they are the same or different and represent, independently, a hydrogen atom or a substituent on the Ring M;
Ring A and Ring B represent, independently, an optionally substituted homocyclic or heterocyclic ring, with the proviso that at least one of them is an optionally substituted heterocyclic ring;
Ring C is an optionally substituted homocyclic or heterocyclic ring;
Ring Z is an optionally substituted nitrogen-containing heterocyclic ring; and
n is an integer from 1 to 6, or a salt thereof has a tachykinin receptor antagonistic activity in vitro, and is useful for preventing or treating depression, anxiety, manic-depressive illness or psychopathy.
The present invention provides compounds, compositions thereof, and methods of using the same for the inhibition of TYK2, and the treatment of TYK2-mediated disorders.
本发明提供了化合物、其组合物以及使用这些化合物来抑制TYK2以及治疗TYK2介导的疾病的方法。
Formal Nitrene Insertion into the β-Vinyl C–H Bond of Acroleins: Synthesis of Enaminals
nitrene insertion reaction into the β-vinyl C–H bond of acroleins with an electron-rich organic azide was developed. The reaction protocol can produce secondary enaminals in high yield with a broad substrate scope. In the reaction, acid mediated [3 + 2] cycloaddition of organic azides with an acrolein generated intermediate protonated triazolines, which were selectivelydecomposed into enaminals with
The present invention relates to a medicine which comprises a compound (I) of the formula:
[wherein the ring M is a heterocylic ring having -N=C<, -CO-N< or -CS-N< as a partial structure ―X=Y〈,
Ra and Rb are bound to each other to form the ring A, or they are the same or different each representing a hydrogen atom or a substituent on the ring M;
the rings A and B each is an optionally substituted homocycle or heterocycle, and at least one of them is an optionally substituted heterocycle;
the ring C is an optionally substituted homocycle or heterocycle;
the ring Z is an optionally substituted nitrogen-containing heterocycle; and
n is an integer of 1 to 6]
or a salt thereof in combination with a drug having an emetic action.
The compounds (I) or their salts are useful as anti-emetic drugs. Particularly, vomiting caused by drugs having an emetic action can be inhibited by these compounds rapidly and safely at a low dose.
本发明涉及一种药物,该药物由式(I)化合物组成:
[其中环 M 是杂环,具有-N=C〈、-CO-N〈或-CS-N〈作为部分结构-X=Y〈、
Ra 和 Rb 相互结合形成环 A,或者它们相同或不同,各自代表环 M 上的一个氢原子或一个取代基;
环 A 和环 B 各自是任选取代的均环或杂环,其中至少一个是任选取代的杂环;
环 C 是任选取代的均环或杂环
环 Z 是任选取代的含氮杂环;以及
n 是 1 至 6 的整数]
或其盐与具有催吐作用的药物结合使用。
化合物 (I) 或其盐类可用作止吐药。特别是,具有催吐作用的药物引起的呕吐,可以通过这些化合物以低剂量快速安全地抑制。