Poly(<i>α</i>
-hydroxy alkanoic acid)s Derived From <i>α</i>
-Amino Acids
作者:Naomi Cohen-Arazi、Abraham J. Domb、Joshua Katzhendler
DOI:10.1002/mabi.201300266
日期:2013.12
Biodegradable polyesters derivedfrom hydrophobic amino acids are synthesized by various techniques, resulting in a wide range of molecular weights. The polymers are prepared via a) direct condensation with p‐toluenesulfonic acid (PTSA) as catalyst, b) ring‐opening polymerization (ROP) of O‐carboxyanhydrides, and c) ROP of cyclic dilactones. The polymers obtained by the first method reach a molecular
Stereoselective N-Acylation Reactions of α-Alkoxy Carbamates
作者:William R. Roush、Lance A. Pfeifer
DOI:10.1021/jo980024c
日期:1998.4.1
An efficient synthetic approach towards fully functionalized tetronic acids: the use of 1,3-dioxolane-2,4-diones as novel protected-activated synthons of α-hydroxy acids
作者:Kyriakos C. Prousis、John Markopoulos、Vickie Mckee、Olga Igglessi-Markopoulou
DOI:10.1016/j.tet.2015.09.017
日期:2015.11
A new strategy for the synthesis of tetronic acids with control over the regioselective introduction of substituents at the C-5 position has been developed. The construction of the densely functionalized quaternary carbon center within these molecules is of great importance. The key element for the proposed protocol was the utilization of O-carboxyanhydrides (OCA's) of optically active α-hydroxy acids
Switchable Polymerization Organocatalysis: From Monomer Mixtures to Block Copolymers
作者:Jiadong Tang、Maosheng Li、Xianhong Wang、Youhua Tao
DOI:10.1002/anie.202115465
日期:2022.4.4
One-pot synthesis of sequence-controlled blockpolymersfrom the monomermixture comprising O-carboxyanhydride (OCA) and epoxide has been realized using a Lewis-pair organocatalyst. The experimental and computational results highlighted the pivotal roles played by the high polymerizability of the OCA monomer for guaranteeing the exquisite sequence selectivity and the synergistic decarboxylation for
使用路易斯对有机催化剂已经实现了由包含O-羧酸酐 (OCA) 和环氧化物的单体混合物的顺序控制的嵌段聚合物的一锅合成。实验和计算结果突出了 OCA 单体的高聚合性对于保证精细的序列选择性和协同脱羧在转换期间促进链端从碳酸盐到醇盐的平稳转变所起的关键作用。