Highly Enantioselective Synthesis of 2-Furanyl-hydroxyacetates from Furans via the Friedel−Crafts Reaction
摘要:
The Friedel-Crafts reaction of alkyl glyoxylates with variously substituted furans was found to be efficiently catalyzed under simple, undemanding conditions by a 6,6'-dibromo-BINOL/Ti(IV) complex with high enantioselectivity. The reaction afforded chiral substituted 2-furanyl-hydroxyacetic acid esters, compounds of high synthetic interest, in good yield and enantiomeric excess, in most examples in the range of 90-97%.
Highly Enantioselective Synthesis of 2-Furanyl-hydroxyacetates from Furans via the Friedel−Crafts Reaction
摘要:
The Friedel-Crafts reaction of alkyl glyoxylates with variously substituted furans was found to be efficiently catalyzed under simple, undemanding conditions by a 6,6'-dibromo-BINOL/Ti(IV) complex with high enantioselectivity. The reaction afforded chiral substituted 2-furanyl-hydroxyacetic acid esters, compounds of high synthetic interest, in good yield and enantiomeric excess, in most examples in the range of 90-97%.
Phenyl-furan compounds as vitamin d receptor modulators
申请人:Gajewski Peter Robert
公开号:US20070105951A1
公开(公告)日:2007-05-10
The present invention relates to novel, non-secosteroidal, phenyl-furan compounds with vitamin D receptor (VDR) modulating activity that are less hypercalcemic than 1α,25dihydroxy vitamin D3. These compounds are useful for treating bone disease and psoriasis.
作者:Grace A. Lutovsky、Samuel N. Gockel、Mark W. Bundesmann、Scott W. Bagley、Tehshik P. Yoon
DOI:10.1016/j.chempr.2023.04.008
日期:2023.6
commercial availability, and structural diversity. Decarboxylativecoupling reactions enable versatile functionalization of these feedstock chemicals, but many of the most general methods require prefunctionalization of carboxylic acids with redox-active moieties. These internal oxidants can be costly, their installation impedes rapid library synthesis, and their use results in environmentally problematic
The Friedel-Crafts reaction of (1R)-8-phenylmenthyl glyoxylate with variously substituted furans was found to be efficiently promoted by SnCl(4) or magnesium salts with high diastereoselectivities. MgBr(2) performs especially well under simple, undemanding conditions, giving both high yields and high diastereoselectivities (> 90%). The reaction afforded chiral substituted furan-2-yl-hydroxyacetic acid esters, compounds of potentially high synthetic interest.
Isomerization of 1-trimethylsilylallenyl ether to 1-trimethylsilylpropargyl ether. Preparation of 1-methoxy-1-alken-3-ynes and 2-methoxy-2,5-dihydrofurans