Novel Synthesis of (3R,4R)‐4‐Acetoxy‐3‐[1′(R)‐tert‐butyldimethylsilyloxyethyl] Azetidin‐2‐one: A Key Intermediate for Penem and Carbapenem Synthesis
摘要:
Diastereoselective synthesis of (3R,4R)-4-acetoxy-3-[1'(R)-tert-butyldimethylsilyloxyethyl] azetidin-2-one (AOSA) using (-)-D-2,10-camphorsultam as a key and recyclable chiral auxiliary is described.
Enantiospecific generation of anti-aldol adducts via conjugate addition to 5-methylene-1,3-dioxan-4-ones
作者:Michael Piber、James W. Leahy
DOI:10.1016/s0040-4039(98)00183-x
日期:1998.4
Michael additions to the exocyclic olefins of optically pure dioxanones (prepared via the asymmetric Baylis-Hillman reaction) are studied. The products can be obtained in excellent diastereoselectivity to ultimately provide products equivalent to those derived via anti aldol additions. Quaternary centers can also be created with good selectivity via this protocol.
Nucleobase phosphonate analogs for antiviral treatment
申请人:Krawczyk H. Steven
公开号:US20050059637A1
公开(公告)日:2005-03-17
The present invention provides novel compounds with activity against infectious viruses. The compounds of the invention may inhibit retroviral reverse transcriptases and thus inhibit the replication of the virus. They are useful for treating human patients infected with a human retrovirus, such as human immunodeficiency virus (strains of HIV-1 or HIV-2) or human T-cell leukemia viruses (HTLV-I or HTLV-II) which results in acquired immunodeficiency syndrome (AIDS) and/or related diseases. The present invention also relates generally to the accumulation or retention of therapeutic compounds inside cells. The invention is more particularly related to attaining high concentrations of active metabolite molecules in HIV infected cells. Intracellular targeting may be achieved by methods and compositions which allow accumulation or retention of biologically active agents inside cells. Such effective targeting may be applicable to a variety of therapeutic formulations and procedures.