55638-53-4Relevant academic research and scientific papers
Chemoenzymatic asymmetric total syntheses of a constituent of Jamaican rum and of (+)-Pestalotin using an enantioconvergent enzyme-triggered cascade reaction
Mayer, Sandra F.,Steinreiber, Andreas,Goriup, Marian,Saf, Robert,Faber, Kurt
, p. 523 - 528 (2002)
A short chemoenzymatic route to two natural products - the first, a constituent of Jamaican rum and the second the (+)-antipode of the gibberelin synergist (-)-Pestalotin - was accomplished based on an enzyme-triggered cascade-reaction. Thus, a racemic halomethyl oxirane was hydrolyzed by bacterial epoxide hydrolases to furnish the corresponding vic-halomethyl-diol, which underwent spontaneous ring-closure to furnish an epoxy alcohol in up to 93% e.e. and ≥99 d.e. Due to the fact that this process was enantioconvergent, the occurrence of the undesired enantiomer was entirely avoided.
Copper-catalyzed enantioselective allylic substitution with alkylboranes
Shido, Yoshinori,Yoshida, Mika,Tanabe, Masahito,Ohmiya, Hirohisa,Sawamura, Masaya
, p. 18573 - 18576 (2013/01/15)
The first catalytic enantioselective allylic substitution reaction with alkylboron compounds has been achieved. The reaction between alkyl-9-BBN reagents and primary allylic chlorides proceeded with excellent γ-selectivities and high enantioselectivities under catalysis of a Cu(I)-DTBM-SEGPHOS system. The protocol produces terminal alkenes with an allylic stereogenic center branched with functionalized sp3-alkyl groups. The reaction with a γ-silicon-substituted allyl chloride affords an efficient strategy for the enantioselective synthesis of functionalized α-stereogenic chiral allylsilanes.
Enzyme-triggered enantioconvergent transformation of haloalkyl epoxides
Mayer, Sandra F.,Steinreiber, Andreas,Orru, Romano V. A.,Faber, Kurt
, p. 4537 - 4542 (2007/10/03)
Biocatalytic hydrolysis of 2,3-disubstituted rac-cis- and rac-trans-haloalkyl epoxides 1a-8a using the epoxide hydrolase activity of whole bacterial cells furnished the corresponding vicinal diols 1b-8b as intermediates; these (spontaneously) underwent ring closure to yield cyclic products 1c-6c through an enzyme-triggered cascade reaction. In particular, cis-configured substrates (1a, 3a, 5a, 7a) were transformed in an enantioconvergent fashion, which resulted in the formation of single stereoisomeric products in 100% des and up to 92% ees from the racemates.
An enzyme-triggered enantio-convergent cascade-reaction
Mayer, Sandra F.,Steinreiber, Andreas,Orru, Romano V.A.,Faber, Kurt
, p. 41 - 43 (2007/10/03)
The biocatalytic hydrolysis of the (±)-2,3-disubstituted cis-chloroalkyl epoxides 1a and 2a using resting cells of Rhodococcus sp. did not give the corresponding chloroalkyl vic-diols 1b, and 2b, respectively, but furnished the rearranged products (2R,3R)-1c and (2R,3R)-2c in high e.e. as the sole products via an enzyme-triggered enantio-convergent cascade-reaction.
