Amino-Protecting Groups Subject to Deblocking under Conditions of Nucleophilic Addition to a Michael Acceptor. Structure−Reactivity Studies and Use of the 2-(tert-Butylsulfonyl)-2-propenyloxycarbonyl (Bspoc) Group
摘要:
A new type of amino-protecting group is described in which a Michael acceptor is incorporated into the protectant so that treatment with a nucleophile will trigger deblocking. Comparison of various Michael accepters showed that for several key electron-withdrawing groups, the order of reactivity was C6H5SO2 > Me3CSO2 > COOEt > CsH5SO > C(6)H(4)NO(2-)p. The reactivity of the nucleophile. (e.g., primary and secondary aliphatic amines) followed an order related to both intrinsic basicity and steric effects. beta-Substituents in the Michael acceptor caused significant retardation of the deblocking process. The Bspoc function was chosen for initial elaboration into a practical system for use in peptide synthesis. Bspoc amino acid chlorides were used as coupling agents and silica-tethered secondary amines as deblocking agents. With the latter, deblocking occurs cleanly and no byproducts remain in the organic solvent in which the deblocking is executed.
METHODS AND INTERMEDIATES FOR PREPARING PHARMACEUTICAL AGENTS
申请人:Polniaszek Richard
公开号:US20100256366A1
公开(公告)日:2010-10-07
The invention provides methods and intermediates that are useful for preparing a compound of formula I:
and salts thereof.
本发明提供了用于制备公式I化合物的有用方法和中间体:
及其盐类。
Unusual two-bond13C,13C coupling constants in sulphones
作者:Christoph Rücker、Hans Fritz
DOI:10.1002/mrc.1260261213
日期:1988.12
structurally diverse sulphones. In open‐chain (single coupling path) sulphones this 2J coupling ranges from 5.5 to 27.2 Hz, while in cyclic (multiple coupling path) sulphones values ranging from 4.3 to 21.6 Hz are observed. Sulphides and sulphoxides do not exhibit a corresponding coupling of comparable magnitude. A positive sign for this coupling is derivedfrom the data of cyclic sulphones. Whereas substituents
Fused Heterocyclic Compounds as Ion Channel Modulators
申请人:Kobayashi Tetsuya
公开号:US20120010192A1
公开(公告)日:2012-01-12
The present disclosure relates to compounds that are sodium channel inhibitors and to their use in the treatment of various disease states, including cardiovascular diseases and diabetes. In particular embodiments, the structure of the compounds is given by Formula I:
wherein R
1
, R
2
, R
3
, R
4
, and R
5
are as described herein, to methods for the preparation and use of the compounds and to pharmaceutical compositions containing the same.
FUSED HETEROCYCLIC COMPOUNDS AS ION CHANNEL MODULATORS
申请人:Corkey Britton
公开号:US20110021521A1
公开(公告)日:2011-01-27
The present invention relates to compounds that are sodium channel inhibitors and to their use in the treatment of various disease states, including cardiovascular diseases and diabetes. In particular embodiments, the structure of the compounds is given by Formula I:
wherein W
1
, W
2
, W
3
, R
1
, Q, X
1
, X
2
and X
3
are as described herein, to methods for the preparation and use of the compounds and to pharmaceutical compositions containing the same.
Water-Soluble CC-1065 Analogs and Their Conjugates
申请人:Beusker Patrick Henry
公开号:US20090318668A1
公开(公告)日:2009-12-24
This invention relates to novel analogs of the DNA-binding alkylating agent CC-1065 and to their conjugates. Furthermore this invention concerns intermediates for the preparation of said agents and their conjugates. The conjugates are designed to release their (multiple) payload after one or more activation steps and/or at a rate and time span controlled by the conjugate in order to selectively deliver and/or controllably release one or more of said DNA alkylating agents. The agents, conjugates, and intermediates can be used to treat an illness that is characterized by undesired (cell) proliferation. As an example, the agents and the conjugates of this invention may be used to treat a tumor.