A series of perfluoroalkylated indenes has been synthesized using four different synthetic pathways. 1-(Pentafluoroethyl)indene and 2-(pentafluoroethyl)indene were prepared by the addition of (pentafluoroethyl)lithium to the appropriate ketones and subsequent dehydration. 2-(Trifluoromethyl)indene was synthesized through the photoinduced addition of trifluoromethyl iodide to indene, followed by dehydroiodination. 1-(Trifluoromethyl)indene was prepared by the addition of (trifluoromethyl)trimethylsilane to 1-indanone followed by deprotection and dehydration and by the sigmatropic cyclization of the appropriate phenylvinyl carbocation. This latter approach was also used to synthesize 1,3-bis(trifluoromethyl)indene and 1,2,3-tris(trifluoromethyl)indene.
Highly Enantioselective Synthesis of Arylaliphatic Tertiary Alcohols using Mutants of an Esterase fromBacillus subtilis
作者:Robert Kourist、Sebastian Bartsch、Uwe T. Bornscheuer
DOI:10.1002/adsc.200600641
日期:2007.6.4
kinetic resolution of a series of acetates of arylaliphatictertiaryalcohols was studied using recombinant esterase variants from Bacillus subtilis (BS2) expressed in E. coli. Highest enantioselectivities (E>100) were achieved in the synthesis of 1,1,1-trifluoro-2-phenylbut-3-yn-2-ol and three para-substituted analogues using BS2 mutant G105A. With mutant E188D only two compounds were converted with
Domino Synthesis of α,β‐Unsaturated γ‐Lactams by Stereoselective Amination of α‐Tertiary Allylic Alcohols
作者:Jianing Xie、Sijing Xue、Eduardo C. Escudero‐Adán、Arjan W. Kleij
DOI:10.1002/anie.201810160
日期:2018.12.17
alcohols equipped with a carboxyl group can be smoothly aminated under ambient conditions by a conceptually new and stereoselective protocol under palladium catalysis. The in situ formed Z‐configured γ‐amino acid cyclizes to afford an α,β‐unsaturated γ‐lactam, releasing water as the only byproduct. This practical catalytic transformation highlights the use of a carboxyl group acting as an activating
A Convergent, Unified Approach to Functionalized Fluoro- and Trifluoromethyl Alkenes
作者:Laurent Debien、Béatrice Quiclet-Sire、Samir S. Zard
DOI:10.1021/ol3023903
日期:2012.10.5
A modular, convergent, and operationally simple route to trifluoromethyl alkenes and vinyl fluorides involving a unique carbon–oxygen bond homolysis is reported. Highly functionalized trifluoromethyl alkenes and vinyl fluorides were obtained in good yields and good selectivity.
Asymmetric Synthesis of α,α-Disubstituted Allylic Amines through Palladium-Catalyzed Allylic Substitution
作者:Wusheng Guo、Aijie Cai、Jianing Xie、Arjan W. Kleij
DOI:10.1002/anie.201705825
日期:2017.9.18
N‐alkyl allyl amine scaffolds through allylic substitution is reported. This approach is based on palladium catalysis and features ample scope with respect to both the allylic precursor and amine reagent, and high asymmetric induction with enantiomeric ratios (e.r.) up to 98.5:1.5. The use of less‐reactive anilines is also feasible, providing enantioenriched α,α‐disubstituted N‐aryl allylicamines.
A conventional silsesquioxane derivative has the problems that the functional groups are restricted and the chemical structure is not readily controlled and that it is expensive. The present inventors have developed a process for producing a silsesquioxane derivative at a high yield by a simple process in order to solve such problems. The novel silsesquioxane derivative according to the present invention is controlled in a structure thereof and has a functional group, which is excellent in reactivity with a target compound, to be modified. The present invention relates to a production process for a silsesquioxane derivative represented by Formula (2), characterized by using a silicon compound represented by Formula (1). In Formula (1) and Formula (2), R is a group selected from hydrogen, alkyl, aryl and arylalkyl; M is a monovalent alkaline metal atom; at least one of Y is a group represented by Formula (3), and the remainder of Y is hydrogen; R
1
and R
2
in Formula (3) represent the same group as defined for R; and Z is a functional group or a group having a functional group.