Analysis of the characteristic sequence of intein and revision of its motifs
摘要:
Since the first intein (Sce VMA) was found in Saccharomydes cerevisiae ATPases gene in 1990, more and more inteins were identified. It is necessary to analyze the new inteins to understand the sequence charateristics of inteins. By searching protein and nucleic acid database systematically, 101 inteins mere found, of which 69 inteins contain homing endonuclease moths. We only analyze the 69 inteins since most inteins are the classic inteins with homing endonuclease motifs. We found that the distribution of these inteins is particular among species and protein. By multiple sequence alignment, some nem sequence characteristics were found and the motifs described previously were revised.
Photochemical Activation of Aromatic Aldehydes: Synthesis of Amides, Hydroxamic Acids and Esters
作者:Nikolaos F. Nikitas、Mary K. Apostolopoulou、Elpida Skolia、Anna Tsoukaki、Christoforos G. Kokotos
DOI:10.1002/chem.202100655
日期:2021.5.20
the activation of aromatic aldehydes has been developed. Utilizing thioxanthen-9-one as the photocatalyst and cheap household lamps as the light source, a variety of aromatic aldehydes have been activated and subsequently converted in a one-pot reaction into amides, hydroxamic acids and esters in good to high yields. The applicability of this method was highlighted in the synthesis of Moclobemide, a
An Efficient Synthesis of Amides and Esters via Triacyloxyboranes
作者:Zhongping Huang、John Reilly、Ronald Buckle
DOI:10.1055/s-2007-973890
日期:2007.4
is used to activate carboxylicacids to generate triacyloxyboranes. The triacyloxyboranes can be effectively reacted with various nucleophiles including alkylamines, arylamines, hydrazides, alcohols and phenols at reflux in toluene to provide the corresponding amides and esters in excellent yield. Aliphaticcarboxylicacids are selectively esterified in the presence of aromatic carboxylicacids under
A useful acylation method using trichloroacetonitrile and triphenylphosphine for solid phase organic synthesis
作者:István Vágó、István Greiner
DOI:10.1016/s0040-4039(02)01241-8
日期:2002.8
A novel acylation procedure was developed for polymer supported synthesis, with in situ generated acyl chlorides usingtrichloroacetonitrile and triphenylphosphine.