A highly enantio‐ and diastereoselective formal (4+3) cycloaddition of 1,3‐diene‐1‐carbamates with 3‐indolylmethanols in the presence of a chiral phosphoric acid catalyst is reported. The approach described herein provides efficient access to 6‐aminotetrahydrocyclohepta[b]indoles in good yields with mostly complete diastereoselectivity and excellent levels of enantioselectivity (>98:2 dr and up to
Degradable polymer and process for production thereof
申请人:Matsumoto Akikazu
公开号:US20090069448A1
公开(公告)日:2009-03-12
In one embodiment of the present invention, a degradable polymer having a peroxide bond therein is disclosed. The degradable polymer can be utilized in the fields of medicals or medical materials, can be applied to a DDS or gene delivery system, and can be used as a novel polymeric material or environmentally-friendly material. A polyperoxide, which is an alternating copolymer, has in a side chain thereof, a functional group (which is a substituent comprising a therapeutic molecule), a water-soluble substituent, or a biodegradable substituent.
A deep cavitand catalyzes the Diels–Alder reaction of bound maleimides
作者:Richard J. Hooley、Julius Rebek Jr.
DOI:10.1039/b713104f
日期:——
A deep cavitand catalyzes DielsâAlder reactions of bound maleimides via activation of the dienophile by interaction with the organized hydrogen bonding network at the cavitand rim. Rapid inâout exchange of reactant and product allows efficient turnover. The increase in steric bulk of the reaction product lessens its binding affinity, reducing (and in some cases completely eliminating) product inhibition.
DEGRADABLE POLYMER AND PROCESS FOR PRODUCTION THEREOF
申请人:Japan Science and Technology Agency
公开号:EP1897898A1
公开(公告)日:2008-03-12
Disclosed is a degradable polymer having a peroxide bond therein. The degradable polymer can be utilized in the fields of medicals or medical materials, can be applied to a DDS or gene delivery system, and can be used as a novel polymeric material or environmentally-friendly material. A polyperoxide (114), which is an alternating copolymer, has in a side chain thereof, a functional group (112) (which is a substituent comprising a therapeutic molecule), a water-soluble substituent, or a biodegradable substituent.
Synthesis of Indoles via 6π-Electrocyclic Ring Closures of Trienecarbamates
作者:Thomas J. Greshock、Raymond L. Funk
DOI:10.1021/ja060282o
日期:2006.4.1
A new method for the preparation of indoles from readily available alpha-haloenones and alpha-(trialkylstannyl)enecarbamates is described. Following a Stille coupling, trienecarbamate 2 is electronically activated to undergo a facile 6pi-electrocyclic ring closure and subsequent oxidation to afford protected aniline 4. Upon deprotection and reductive amination, acid 5 underwent clean cyclization to N-acetylindole 6 (Ac2O, NEt3, 130 degrees C). This method has been used to construct a variety of substituted indoles that are not easily prepared by conventional indole annelation methods.