Synthesis and Lipase-Catalyzed Resolution of 5-(Hydroxymethyl)-1,3-dioxolan-4-ones: Masked Glycerol Analogs as Potential Building Blocks for Pharmaceuticals
摘要:
(Hydroxymethyl)-1,3-dioxolan-4-ones from mandelic and lactic acids and 1,5,5-trimethyl-3-phenyloxazolidin-2-one from mandelamide were alpha-alkylated using benzyl chloromethyl ether. Reductive debenzylation of the products of alkylation unmasked the hydroxymethyl groups. The compounds obtained in this fashion were subsequently subjected to lipase-catalyzed resolution in organic media. Depending on the lipase and substrate employed, enantiomeric ratios up to E = 200 were observed. The obtained optically pure compounds can be considered as masked 2-substituted glycerol equivalents, which could be used for the preparation of tertiary (aryloxy)propanolamines, compounds having potential beta-blocking activity.
Synthesis and Lipase-Catalyzed Resolution of 5-(Hydroxymethyl)-1,3-dioxolan-4-ones: Masked Glycerol Analogs as Potential Building Blocks for Pharmaceuticals
作者:Robert P. Hof、Richard M. Kellogg
DOI:10.1021/jo952021v
日期:1996.1.1
(Hydroxymethyl)-1,3-dioxolan-4-ones from mandelic and lactic acids and 1,5,5-trimethyl-3-phenyloxazolidin-2-one from mandelamide were alpha-alkylated using benzyl chloromethyl ether. Reductive debenzylation of the products of alkylation unmasked the hydroxymethyl groups. The compounds obtained in this fashion were subsequently subjected to lipase-catalyzed resolution in organic media. Depending on the lipase and substrate employed, enantiomeric ratios up to E = 200 were observed. The obtained optically pure compounds can be considered as masked 2-substituted glycerol equivalents, which could be used for the preparation of tertiary (aryloxy)propanolamines, compounds having potential beta-blocking activity.
Photochemical reactions of N-alkyl-α-oxoamides
作者:Hiromu Aoyama、Masami Sakamoto、Yoshimori Omote
DOI:10.1039/p19810001357
日期:——
Photolysis of N-alkyl-α-oxoamides gave oxazolidin-4-ones or β-lactams as major products as in the case of NN-dialkyl-α-oxoamides. The formation of cyclohexanone in the photolysis of N-cyclohexylbenzoylformamide in an aqueous acidic medium was most reasonably explained by hydrolysis of an intermediate, N-cyclohexylidenemandelamide.