Cesar Colon | Researchain

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Featured researches published by Cesar Colon.

Tetrahedron Letters | 2001

A regioselective PCl5 mediated dehydration for preparing Δ9,11 corticosteroids

Xiaoyong Fu; Chou-Hong Tann; Tiruvettipuram K. Thiruvengadam; Junning Lee; Cesar Colon

Abstract A regioselective PCl 5 -induced dehydration of 11α-hydroxy corticosteroids was invented to provide the corresponding Δ 9,11 double bond trienes in excellent yield (>90%) with 99:1 regioisomeric ratio to the Δ 11,12 isomers. A syn -elimination mechanism was proposed for this reaction.

Synthetic Communications | 1999

A One-Pot and Efficient Preparation of (S)-Benzyl 4-Hydroxy-2-Pentynoate from (S)-n-Butyn-2-Ol Using an Unusual Lithiation with n-BuLi and a Catalytic Amount of Hexamethyldisilazane

Gaifa Lai; Cesar Colon

Abstract A one-pot, four-step procedure was developed for the efficient preparation of (S)-benzyl 4-hydroxy-2-pentynoate (1) from (S)-3-butyn-2-ol (2), which involved as a key step the unusual lithiation of the silyl ether 5 with n-BuLi in the presence of a catalytic amount of hexamethyldisilazane (HMDS).

Archive | 1994

Process for the synthesis of azetidinones

Tiruvettipuram K. Thiruvengadam; Xiaoyong Fu; Chou-Hong Tann; Timothy Mcallister; John S. Chiu; Cesar Colon

Archive | 1992

Substituted beta-lactam compounds useful as hypocholesterolemic agents and processes for the preparation thereof

Duane A. Burnett; John W. Clader; Tiruvettipuram K. Thiruvengadam; Chou-Hong Tann; Junning Lee; Timothy Mcallister; Cesar Colon; Derek H. R. Barton; Ronald Breslow; Sundeep Dugar; Wayne Vaccaro

Archive | 1995