Cycloadditions. 48. Novel heterocycles by bis heteroannulation of oxazoles
摘要:
We report the first examples of intramolecular Diels-Alder addition of heterodienophiles N = N, C =N, C = O, C = S to oxazoles. The required 5-ethoxy- and 5-phenyloxazoles were synthesized bearing a side chain of variable length on C-2 to which the different heterodienophiles are attached. The products of the thermal bis heteroannulation are 3-triazolines, imidazolines, oxazolines, or thiazolines fused to a five- to six-membered ring. Relative reactivities were established and the mechanism is discussed.
Cycloadditions. 48. Novel heterocycles by bis heteroannulation of oxazoles
摘要:
We report the first examples of intramolecular Diels-Alder addition of heterodienophiles N = N, C =N, C = O, C = S to oxazoles. The required 5-ethoxy- and 5-phenyloxazoles were synthesized bearing a side chain of variable length on C-2 to which the different heterodienophiles are attached. The products of the thermal bis heteroannulation are 3-triazolines, imidazolines, oxazolines, or thiazolines fused to a five- to six-membered ring. Relative reactivities were established and the mechanism is discussed.
Beta lactam compounds and their use as inhibitors of tryptase
申请人:Bristol-Myers Squibb Co.
公开号:US06335324B1
公开(公告)日:2002-01-01
Compounds of the formulas:
are disclosed. These compounds inhibit tryptase as well as other enzyme systems or are selective tryptase inhibitors and are useful as antiinflammatory agents particularly in the treatment of chronic asthma.
An Improved Bouveault−Blanc Ester Reduction with Stabilized Alkali Metals
作者:Brian S. Bodnar、Paul F. Vogt
DOI:10.1021/jo802778z
日期:2009.3.20
ester reduction have been developed using sodium in silica gel (Na-SG), a free-flowing powder that can be easily handled in the open atmosphere. Primary alcohols were prepared in excellent yield from a variety of aliphatic esters under mild reaction conditions. The chemistry presented here is far safer than the classic Bouveault−Blanc reduction and is competitive with more modern hydride reduction methods
Photoassisted Diversity-Oriented Synthesis: Intramolecular Cycloadditions of Photogenerated Azaxylylenes with Oxazole Pendants, and Subsequent Postphotochemical Multicomponent Modifications
作者:N. N. Bhuvan Kumar、Andrei G. Kutateladze
DOI:10.1021/acs.orglett.5b03503
日期:2016.2.5
Photogenerated aza-o-xylylenes undergo intramolecular cycloaddition reactions to tethered oxazoles, with primary photoproducts featuring a reactive cyclic imine moiety suitable for multicomponent postphotochemical transformations. For example, the reaction of these imine photoproducts with bromoacetyl bromide leads to a key 1,4-dielectrophilic synthon, offering access to diverse polyheterocyclic molecular
Short,F.W.; Long,L.M., Journal of Heterocyclic Chemistry, 1969, vol. 6, p. 707 - 712
作者:Short,F.W.、Long,L.M.
DOI:——
日期:——
Castration-Resistant Prostate Cancer
申请人:NUtech Ventures
公开号:US20160310528A1
公开(公告)日:2016-10-27
This invention relates to inhibitors of UDP-glucose dehydrogenase, and more particularly to UDP-glucose dehydrogenase inhibitors that are useful in the treatment of prostate cancer. Methods of inhibiting UDP-glucose dehydrogenase and improving the efficacy of additional prostate cancer therapies are also provided.