Vicinal Tricarbonyl products from singlet oxygen reactions.
作者:Harry H. Wasserman、William T. Han
DOI:10.1016/0040-4039(84)80120-3
日期:1984.1
Vicinaltricarbonyl systems are readily formed by reacting β-dicarbonyl precursors with DMF acetal to form enamines which are then cleaved by photooxidation. This procedure may be applied to the formation of carbacephams.
Highly Enantioselective Carbonyl–Ene Reactions of 2,3‐Diketoesters: Efficient and Atom‐Economical Process to Functionalized Chiral α‐Hydroxy‐β‐Ketoesters
作者:Phong M. Truong、Peter Y. Zavalij、Michael P. Doyle
DOI:10.1002/anie.201402233
日期:2014.6.16
Carbonyl–enereactions of 2,3‐diketoesters catalyzed by [Cu(S,S)‐tBu‐box}](SbF6)2 [box=bis(oxazoline)] generate chiralα‐functionalizedα‐hydroxy‐β‐ketoesters in up to 94 % yield and 97 % ee. The 2,3‐diketoesters are conveniently accessed from the corresponding α‐diazo‐β‐ketoester, and a catalyst loading as low as 1.0 mol % can be achieved.
The present invention provides compounds having Formula I
and their use for the treatment of cancer.
本发明提供了具有I式的化合物以及它们用于治疗癌症的用途。
Intermediates for the preparation of heteroaryl derivatives of
申请人:E. R. Squibb & Sons, Inc.
公开号:US05420277A1
公开(公告)日:1995-05-30
Antibacterial activity is exhibited by novel compounds having the formula ##STR1## where R.sub.1, R.sub.2, and M are as defined herein and X is --(CH.sub.2).sub.n -- wherein n is 0, 1, 2, 3 or 4 or CR.sub.3 R.sub.4 wherein R.sub.3 and R.sub.4 are the same or different and each is hydrogen, --CH.sub.3 or --C.sub.2 H.sub.5 or R.sub.3 and R.sub.4 taken together with the carbon atom to which they are attached form a 3, 4, 5, 6 or 7-membered cycloalkyl ring. Also described are various intermediates for the preparation of compounds of formula 1.