Stereoselective Olefination Reactions Promoted by Rieke Manganese
作者:José Concellón、Humberto Rodríguez-Solla、Vicente del Amo、Pamela Díaz
DOI:10.1055/s-0029-1216880
日期:2009.8
applied to develop a novel and direct synthesis of (E)-α,β-unsaturated esters or amides and (Z)-α,β-unsaturated α-halo esters and α-choroamides through a Mn*-mediated sequential olefination protocol of aldehydes with dichloro esters or amides and trihalo esters or trichloroamides, respectively. manganese - elimination reactions - stereoselectivity - α,β-unsaturated esters - α,β-unsaturated amides - metalation
Stereoselective synthesis of (Z)-α-haloacrylic acid derivatives, and (Z)-haloallylic alcohols from aldehydes and trihaloesters or amides promoted by Rieke manganese
作者:José M. Concellón、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1039/b803449d
日期:——
A Mn*-promoted sequential process directed toward the synthesis of (Z)-α-halo-α,β-unsaturated esters or amides is described. In both cases, the process takes place with complete Z-stereoselectivity. In addition, (Z)-α-chloro-α,β-unsaturated ketones and carboxylic acids, and (Z)-haloallylic alcohols were readily prepared from (Z)-α-halo-α,β-unsaturated amides derived from morpholine, or esters. A mechanism has been proposed to explain the sequential process and the stereoselectivity observed.
Stereoselective synthesis of (Z)-α-halo-α,β-unsaturated esters, and amides from aldehydes and trihaloesters or amides promoted by manganese
作者:José M. Concellón、Humberto Rodríguez-Solla、Pamela Díaz
DOI:10.1039/b717513b
日期:——
Preliminary results of a Mn-promoted sequential process directed toward the stereoselective synthesis of different (Z)-α-halo-α,β-unsaturated compounds are described.
The pyrrolidine and morpholine enamines of cyclic ketones such as cyclohexanone and cyclopentanone were successfully diacetylated at alpha- and alpha'-positions with trichloroacetyl chloride using zinc catalyst. Morpholine enamines of the cyclic ketones gave acetylated morpholine in good yields besides the corresponding diacetylated cyclicenamines. When the same reactions were performed by using triethylamine
Antiatherosclerotic and antithrombotic 1-benzopyran-4-ones and
申请人:Pharmacia & Upjohn Company
公开号:US05703075A1
公开(公告)日:1997-12-30
This invention relates to compounds of Formula I ##STR1## which are useful in association with a pharmaceutical carrier as antiatherosclerotic agents. In addition, various compounds of Formula I are useful inhibitors of cell proliferation.