Auxiliary-Directed Pd-Catalyzed γ-C(sp<sup>3</sup>)–H Bond Activation of α-Aminobutanoic Acid Derivatives
作者:Kalyan Kumar Pasunooti、Biplab Banerjee、Terence Yap、Yaojia Jiang、Chuan-Fa Liu
DOI:10.1021/acs.orglett.5b03118
日期:2015.12.18
New bidentate auxiliaries derived from the isoxazole-3-carboxamide and oxazole-4-carboxamide moieties were used for Pd-catalyzedC(sp3)–H bond activation. The results show that, when placed on a primary amine compound, 5-methylisoxazole-3-carboxamide (MICA) directsPd-catalyzed activation of inert γ-C(sp3)–H bonds for C–C bond formation. Selective and efficient arylation and alkylation of several α-aminobutanoic
Synthetic studies towards anti-SARS agents: application of an indium-mediated allylation of α-aminoaldehydes as the key step towards an intermediate
作者:Shu-Sin Chng、Truong-Giang Hoang、Wei-Woon Wayne Lee、Mun-Pun Tham、Hui Yvonne Ling、Teck-Peng Loh
DOI:10.1016/j.tetlet.2004.10.146
日期:2004.12
AG7088 was identified as a good starting point for modification, leading to an efficient and bio-available inhibitor for the SARS coronavirus main proteinase (SARS-CoV M-pro). Synthesis of intermediate I and analogues proceeded via a highly diastereoselective indium-mediated allylation of alpha-aminoaldehydes. (C) 2004 Elsevier Ltd. All rights reserved.
5-Methylisoxazole-3-carboxamide-Directed Palladium-Catalyzed γ-C(sp<sup>3</sup>)–H Acetoxylation and Application to the Synthesis of γ-Mercapto Amino Acids for Native Chemical Ligation
作者:Kalyan Kumar Pasunooti、Renliang Yang、Biplab Banerjee、Terence Yap、Chuan-Fa Liu
DOI:10.1021/acs.orglett.6b01160
日期:2016.6.3
Palladium-catalyzed acetoxylation of the primary γ-C(sp3)–H bonds in the aminoacids Val, Thr, and Ile was achieved using a newly discovered 5-methylisoxazole-3-carboxamide directing group. The γ-acetoxylated α-amino acid derivatives could be easily converted to γ-mercapto aminoacids, which are useful for native chemical ligation (NCL). The first application of NCL at isoleucine in the semisynthesis