Synthesis of Highly Functionalized
Allene-Appended Oxindoles and 2-Oxo-1,2-dihydroindol-3-ylidene-2,5-dihydrofurans via
Claisen Rearrangement and Cyclization
Synthesis of highly functionalized allene appended oxin-dole derivatives from vinyl propargyl ether derivatives of Morita― Baylis―Hillman adducts of isatin via Claisen rearrangement has been achieved. Synthetic utility of the allene derivatives obtained has been demonstrated with the synthesis of methyl 2,5-dihydro-5-methyl-2-(1-methyl-2-oxoindolin-3-ylidene)furan-3-carboxylates in a one-pot cyclization
Highly diastereo- and enantioselective [3+2] annulation of isatin-derived Morita–Baylis–Hillman carbonates with trifluoropyruvate catalyzed by tertiary amines
An enantioselective [3+2] annulation of Morita-Baylis-Hillmancarbonates with trifluoropyruvate catalyzed by modified cinchona alkaloids was developed in good to excellent yields with excellent diastereo- and enantioselectivities.
An Access to Highly Functionalized Dihydrobenzofuran Spirooxindole Scaffolds
作者:Daqian Wang、Jing Sun、Ying Han、Qiu Sun、Chao-Guo Yan
DOI:10.1021/acs.orglett.2c03123
日期:2022.10.28
dihydrobenzofuran spirooxindole scaffolds via base promoted cascadeannulation of Morita–Baylis–Hillman (MBH) carbonates of isatins with ortho-hydroxychalcones or ortho-hydroxy-β-nitrostyrenes. The complex polycyclic compounds were conveniently synthesized in satisfactory yields and with high diastereoselectivity. This protocol provides a swift and convenient approach for the assembly of diverse highly functionalized
from isatin derivatives using deep eutectic solvents containing choline chloride (ChCl). Research results showed that the solvent based on ChCl/ethylene glycol (1:2) is a very effective alternative for the synthesis of adducts derived from acrylonitrile, resulting in compounds with excellent yields and short reaction times, after optimization of the catalyst (DABCO). Regarding the synthesis of adducts
Convenient Synthetic Protocols for Diverse Functionalized Dihydrobenzofuran-Fused Spiro-indanedione-oxindole Scaffolds
作者:Jing Sun、Xueyan Liu、Qiu Sun、Ying Han、Chao-Guo Yan
DOI:10.1021/acs.joc.3c00887
日期:2023.8.18
1′-cyclopenta[b]benzofuran-2′,3″’-indolines] could be selectively synthesized by using DABCO or DMAP as a base promoter. More importantly, DABCO or DMAP facilitated the annulation reaction of MBH formates of isatins and 2-(o-hydroxybenzylidene)-1,3-indanediones selectively, resulting in spiro[cyclopropa[c]chromene-1,2′-indene]-1′,3′-diones or dispiro[indene-2,1′-cyclopenta[b]benzofuran-2′,3″’-indolines]
通过靛红和 2-(邻羟基亚苄基)-1,3-茚满二酮的 Morita-Baylis-Hillman (MBH) 碳酸酯的碱促进环化反应,方便地合成了多种功能化的二氢苯并呋喃螺环-茚满二酮-羟吲哚支架。以DABCO或DMAP为基础促进剂,可以选择性合成两个非对映体二螺[茚-2,1'-环戊[ b ]苯并呋喃-2',3"'-二氢吲哚]。更重要的是,DABCO或DMAP选择性地促进靛红和2-(邻羟基亚苄基)-1,3-茚二酮的MBH甲酸酯的成环反应,产生螺[环丙[ c ]色烯-1,2'-茚]-1 ',3'-二酮或二螺[茚-2,1'-环戊[ b ]苯并呋喃-2',3"'-二氢吲哚]。此外,与靛红的 MBH 马来酰亚胺进行类似反应,得到二螺[茚-2,5'-苯并呋喃[2',3':1,5]环戊[1,2- c ]吡咯-4',3"'-二氢吲哚] 高产率和高非对映选择性。