Enzymatic kinetic resolution of internal propargylic diols. Part I: a new approach for the synthesis of (S)-pent-2-yn-1,4-diol, a natural product from Clitocybe catinus
作者:Jeiely G. Ferreira、Cleverson R. Princival、Dyego M. Oliveira、Renata X. Nascimento、Jefferson L. Princival
DOI:10.1039/c5ob00386e
日期:——
Employing a two round sequence EKR, mono- and bis-acetoxy propargylic products were obtained in a high enantiomeric ratio (E > 200). The efficiently resolved chiral 8b was applied in a concise synthesis of (S)-1b, an optically active natural product produced by fungi Clitocybe catinus.
Gold(I)-Catalyzed Stereoselective Formation of Functionalized 2,5-Dihydrofurans
作者:Andrea Buzas、Florin Istrate、Fabien Gagosz
DOI:10.1021/ol0606839
日期:2006.4.1
A study concerning the gold(l)-catalyzed rearrangement of butynediol monobenzoates into functionalized 2,5-dihydrofurans is described. The mild reaction conditions employed allow the efficient and rapid stereoselective synthesis of a variety of 2,5-dihydrofurans via a sequence of two gold(l)-catalyzed isomerization steps.
CATALYTIC ENANTIOSELECTIVE ADDITION OF TERMINAL ALKYNES TO ALDEHYDES: PREPARATION OF (S)-(-)-1,3-DIPHENYL-2-PROPYN-1-OL AND (S)-(-)-4-METHYL-1-PHENYL-2-PENTYN-1,4-DIOL
作者:Takita, Ryo、Harada, Shinji、Ohshima, Takashi、Matsunaga, Shigeki、Shibasaki, Masakatsu、Fontaine, Shaun、Robinson, Julia、Danheiser, Rick L.
DOI:10.15227/orgsyn.085.0118
日期:——
Efficient Enantioselective Additions of Terminal Alkynes and Aldehydes under Operationally Convenient Conditions
作者:Dean Boyall、Doug E. Frantz、Erick M. Carreira
DOI:10.1021/ol026282k
日期:2002.7.1
[GRAPHICS]The enantioselective addition reaction of terminal acetylenes and aldehydes mediated by Zn(OTf)(2) and N-methyl ephedrine can be conducted with reagent grade solvent containing 84-1000 ppm H2O. The products can be isolated in high yield and useful enantioselectivities (up to 99% ee).
Ligand accelerated indium(<scp>iii</scp>)-catalyzed asymmetric alkynylation of aldehydes with 2-methyl-3-butyn-2-ol as an ethyne equivalent donor
Indium(III)-catalyzed asymmetric alkynylation of aryl, heteroaryl, alkyl and alkenyl aldehydes with 2-methyl-3-butyn-2-ol as an ethyne equivalent donor was realized, and products were obtained in moderate to good yields (up to 97%) and high enantioselectivities (up to 99% ee) using 2–10 mol% of catalyst.