Nucleophile-dependent substitution reactions of 5-halovaleric acid esters: synthesis of 6,12-dioxamyristic acid
摘要:
The reaction of 5-ethoxypentan-1-ol with a variety of 5-halovalerate alkyl esters afforded ester exchange products rather than the expected products of Williamson ether synthesis. The virtually unknown reaction of an alkoxide with a 5-halovalerate ester contrasts strongly with literature reports of reactions involving other nucleophiles in which the halogen substitution products are nearly always isolated. An explanation is offered for this behavior in terms of a chelation-induced conformation of the substrate. Although the direct synthetic approach failed, the hitherto unknown title compound could still be prepared, albeit in six steps in 6% overall yield. The approach used is discussed along with the interesting chemistry of this system.
Nucleophile-dependent substitution reactions of 5-halovaleric acid esters: synthesis of 6,12-dioxamyristic acid
摘要:
The reaction of 5-ethoxypentan-1-ol with a variety of 5-halovalerate alkyl esters afforded ester exchange products rather than the expected products of Williamson ether synthesis. The virtually unknown reaction of an alkoxide with a 5-halovalerate ester contrasts strongly with literature reports of reactions involving other nucleophiles in which the halogen substitution products are nearly always isolated. An explanation is offered for this behavior in terms of a chelation-induced conformation of the substrate. Although the direct synthetic approach failed, the hitherto unknown title compound could still be prepared, albeit in six steps in 6% overall yield. The approach used is discussed along with the interesting chemistry of this system.
Method of N-acylating peptide and proteins with diheteroatom substituted
申请人:Washington University
公开号:US05571689A1
公开(公告)日:1996-11-05
A method for acylating peptides and proteins with the CoA-ester of diheteroatom substituted C.sub.13 to C.sub.14 myristic acid analogs catalyzed by N-myristoyltransferase is presented. In the analogs, two non-adjacent methylene groups, which are normally at positions 3-13, are replaced with oxygen or sulfur atoms.
Novel diheteroatom-substituted fatty acid analog substrates of myristoylating enzymes are provided which contain oxygen and/or sulfur in place of two methylene groups in carbon positions from 3 to 13 in the fatty acid chain of a C₁₃ - C₁₄ fatty acid analog or alkyl ester thereof in which said oxygen or sulfur atoms are separated by at least one methylene group.