Enantioselective Allylations of Azlactones with Unsymmetrical Acyclic Allyl Esters
作者:Barry M. Trost、Xavier Ariza
DOI:10.1021/ja992754n
日期:1999.11.1
A catalytic asymmetric synthesis of quaternaryamino acids has been developed. The method derives from the asymmetric allylic alkylation (AAA) reaction with chiral palladium catalysts derived from π-allylpalladium chloride dimer and the bis-2-diphenylphosphinobenzamide of R,R-1,2-diaminocyclohexane and related ligands. Highly symmetrical allylating agents such as allyl acetate and 2-methallyl acetate
Enantioselective Iridium-Catalyzed Phthalide Formation through Internal Redox Allylation of Phthalaldehydes
作者:James M. Cabrera、Johannes Tauber、Michael J. Krische
DOI:10.1002/anie.201712015
日期:2018.1.26
An inside job: Enantioselective phthalide synthesis was achieved through internal redox allylation of o‐phthalaldehydes. Oxidative esterification is balanced by reductive carbonyl addition to achieve an overall redox‐neutral process. This method enabled formal syntheses of ent‐spirolaxine methyl ether and CJ‐12,954.
Synthetic Studies towards Halichondrins: Synthesis of the C.27–C.38 Segment
作者:Thomas D. Aicher、Keith R. Buszek、Francis G. Fang、Craig J. Forsyth、Sun Ho Jung、Yoshito Kishi、Paul M. Scola
DOI:10.1016/s0040-4039(00)91671-x
日期:1992.3
An efficient synthesis of the C.27–C.38 segment of halichondrins is accomplished, using the Ireland-Claisen rearrangement, Ni(II)/Cr(II)-mediated coupling and Michael reactions as the key steps.
[EN] PROCESS FOR PREPARATION OF 3-((2S,5S)-4-METHYLENE-5-(3-OXOPROPYL)TETRAHYDROFURAN-2-YL) PROPANOL DERIVATIVES AND INTERMEDIATES USEFUL THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE 3-((2S,5S)-4-MÉTHYLÈNE-5- (3-OXOPROPYL)TÉTRAHYDROFURAN-2-YL)PROPANOL ET D'INTERMÉDIAIRES UTILES À LEUR PRÉPARATION
申请人:ALPHORA RES INC
公开号:WO2013086634A1
公开(公告)日:2013-06-20
Discloses is a process for preparation of a compound of formula 7, or a derivative thereof, wherein PG1 is an alcohol protecting group. Also, disclosed are intermediates and processes for their preparation. The compound of formula 7 can be useful in the preparation of halinchondrin analogs such as Eribulin.
Iridium-Catalyzed <i>anti</i>-Diastereo- and Enantioselective Carbonyl (Trimethylsilyl)allylation from the Alcohol or Aldehyde Oxidation Level
作者:Soo Bong Han、Xin Gao、Michael J. Krische
DOI:10.1021/ja103299f
日期:2010.7.7
identical reaction conditions, carbonyl (trimethylsilyl)allylation is achieved directly from the alcoholoxidationlevel to furnish an equivalent set of adducts 4a-i with roughly equivalent isolated yields and stereoselectivities. To evaluate the synthetic utility of the reaction products 4a-i, adduct 4g was converted to the 1,4-ene-diol 5g via dioxirane-mediated oxidative desilylation with allylic transposition