A traceless approach to amide and peptide construction from thioacids and dithiocarbamate-terminal amines
作者:Wenteng Chen、Jiaan Shao、Miao Hu、Wanwan Yu、Marc A. Giulianotti、Richard A. Houghten、Yongping Yu
DOI:10.1039/c2sc21317f
日期:——
with a range of unprotected side chains of aminoacid. The ability to produce amide or peptides by a traceless removal of the auxiliary is a significant virtue of the method. Meanwhile, the application of this new peptide-bond-forming reaction to the synthesis of novel endomorphin (EM) derivatives with various binding potencies was realized.
isocyanates at the benzylic position upon irradiation with visiblelight in the presence of an iridium photoredox catalyst, a bromide anion, and a nickel catalyst, producing N-substituted α-aryl amides. An analogous carbamoylation reaction of aliphatic C–H bonds of alkanes took place when UV light and a diaryl ketone were used instead of visiblelight and the iridium complex. The present reaction offers
Effect of
<i>gem</i>
‐Difluorination on the Key Physicochemical Properties Relevant to Medicinal Chemistry: The Case of Functionalized Cycloalkanes
作者:Sergey Holovach、Kostiantyn P. Melnykov、Artem Skreminskiy、Maksym Herasymchuk、Olha Tavlui、Danylo Aloshyn、Petro Borysko、Alexander B. Rozhenko、Sergey V. Ryabukhin、Dmitriy M. Volochnyuk、Oleksandr O. Grygorenko
DOI:10.1002/chem.202200331
日期:2022.4
Fearless Fluorine: the effect of gem-diflurination on acidity/basicity (pKa), lipophilicity (LogP), aqueous solubility (Sw), and metabolic stability (intrinsic clearance, CLint) of functionalized C3−C7-cycloalkanes is established and compared to those of non-fluorinated and acyclic counterparts. While the pKa values are varied similarly for the cyclic and acyclic series and can be explained by the
Fearless Fluorine:gem -diflurination 对官能化 C 3 -C 7 -环烷烃的酸度/碱度 (pK a )、亲油性 (Log P )、水溶性 ( S w ) 和代谢稳定性(固有清除率,CL int )的影响建立并与非氟化和无环对应物进行比较。虽然循环和非循环系列的 p K a值变化相似,并且可以通过氟原子的感应效应来解释,但 Log P和S w趋势更复杂。CL整数宝石二氟化后的值保持不变或略有改善。