Syntheses and reactivities of non-symmetrical “active ester” bi-dentate cross-linking reagents having a phthalimidoyl and acid chloride, 2-benzothiazole, or 1-benzotriazole group
active ester” bi-dentate cross-linking reagents having an acid chloride, 2-benzothiazole, or 1-benzotriazole group (i.e., 9, 15, and 16) on the basis of the reactivity study of the “active ester” model compounds, 11–14, toward the various nucleophiles and examined their reaction selectivity towards the same nucleophiles. Then, we applied for the modification of cholesterol at the more reactive site of
Facile oxidative conversion of alcohols to esters using molecular iodine
作者:Naoshi Mori、Hideo Togo
DOI:10.1016/j.tet.2005.03.097
日期:2005.6
A simple, efficient, and high-yield procedure for the oxidative conversion of alcohols to various types of esters and ketones, with molecular iodine and potassium carbonate was successfully carried out.
Photocatalytic esterification under Mitsunobu reaction conditions mediated by flavin and visible light
作者:M. März、J. Chudoba、M. Kohout、R. Cibulka
DOI:10.1039/c6ob02770a
日期:——
The usefulness of flavin-based aerial photooxidation in esterification underMitsunobu reaction conditions was demonstrated, providing aerial dialkyl azodicarboxylate recycling/generation from the corresponding dialkyl hydrazine dicarboxylate. Simultaneously, activation of triphenylphosphine (Ph3P) by photoinduced electron transfer from flavin allows azo-reagent-free esterification. An optimized system
Umpolung reactions in an ionic liquid catalyzed by electrogenerated N-heterocyclic carbenes. Synthesis of saturated esters from activated α,β-unsaturated aldehydes
The umpolung reaction of alpha,beta-unsaturated aldehydes to saturated esters has been carried out in an ionic liquid by organocatalysis of electrogenerated NHC. The roles of solvent, precatalyst and proton donor of the ionic liquid have been verified and good to high yields of esters have been obtained using a "green" and mild methodology.
Introducing Savie: A Biodegradable Surfactant Enabling Chemo- and Biocatalysis and Related Reactions in Recyclable Water
作者:Joseph R. A. Kincaid、Madison J. Wong、Nnamdi Akporji、Fabrice Gallou、David M. Fialho、Bruce H. Lipshutz
DOI:10.1021/jacs.2c13444
日期:——
organic synthesis in recyclable water. This includes homogeneouscatalysis (including examples employing only ppm levels of catalyst), heterogeneous catalysis, and biocatalytic transformations, including a multistep chemoenzymatic sequence. Use of Savie frequently leads to significantly higher yields than do conventional surfactants, while obviating the need for waste-generating organic solvents.
Savie 是一种可生物降解的表面活性剂,源自维生素 E 和聚肌氨酸 (PSar),开发用于可循环水中的有机合成。这包括均相催化(包括仅使用 ppm 级催化剂的例子)、多相催化和生物催化转化,包括多步化学酶序列。使用 Savie 通常会比传统表面活性剂产生显着更高的产率,同时无需使用产生废物的有机溶剂。