Design, synthesis and application of a new type of bifunctional Le-Phos in highly enantioselective γ-addition reactions of N-centered nucleophiles to allenoates
作者:Haile Qiu、Xiaofeng Chen、Junliang Zhang
DOI:10.1039/c9sc04073k
日期:——
A novel class of bifunctional cyclic phosphine catalysts (Le-Phos) is reported, which showed good performances in enantioselective γ-addition reactions of N-centered nucleophiles and allenoates under mild conditions.
The invention generally relates to novel polymers (SMAMPs) and their syntheses and use. The polymers exhibit promising properties of AMPs. In particularly, for example, a ring-opening metathesis polymerization (ROMP) platform was developed that allows syntheses of SMAMPs that employ a minimum number of norbornene-based building blocks and/or enable easy and independent variation of hydrophobic and hydrophilic groups in the monomer units and/or along the polymeric backbone to finetune and select desirable properties of the polymers.
Synthesis of pyrimido[2,1-<i>a</i>]isoindolone and isoindolo[2,1-<i>a</i>]quinazolinone <i>via</i> intramolecular aza-Prins type reaction
作者:Subhamoy Biswas、Bikoshita Porashar、Pallav Jyoti Arandhara、Anil K. Saikia
DOI:10.1039/d1cc04554g
日期:——
A novel aza-Prins type cyclizationreaction involving N-acyliminium ions and amides is reported for the synthesis of tetrahydropyrimido[2,1-a]isoindole-2,6-dione and 6,6a-dihydroisoindolo[2,1-a]quinazoline-5,11-dione derivatives in excellent yields. The strategy features inexpensive reagents, mild reaction conditions, and metal-free synthesis of N-heterocyclic frameworks. Further, post-synthetic modification
涉及一种新颖氮杂普林斯型环化反应Ñ -acyliminium离子和酰胺被报告四氢嘧啶并[2,1-的合成一个]异吲哚-2,6-二酮和6,6-一个-dihydroisoindolo [2,1-一个]喹唑啉-5,11-二酮衍生物,产率极好。该策略的特点是试剂价格低廉,反应条件温和,N-杂环骨架的无金属合成。此外,合成后的修饰导致其前所未有的三唑、四环二氮杂环戊二烯[ def ]菲-1,4(9 a 1 H )-二酮和羰基衍生物的形成。
Periodic Nanostructures From Self Assembled Wedge-Type Block-Copolymers
申请人:XIA Yan
公开号:US20160024244A1
公开(公告)日:2016-01-28
The invention provides a class of wedge-type block copolymers having a plurality of chemically different blocks, at least a portion of which incorporates a wedge group-containing block providing useful properties. For example, use of one or more wedge group-containing blocks in some block copolymers of the invention significantly inhibits chain entanglement and, thus, the present block copolymers materials provide a class of polymer materials capable of efficient molecular self-assembly to generate a range of structures, such as periodic nanostructures and microstructures. Materials of the present invention include copolymers having one or more wedge group-containing blocks, and optionally for some applications copolymers also incorporating one or more polymer side group-containing blocks. The present invention also provides useful methods of making and using wedge-type block copolymers.