Synthesis of Novel Oxime Functionalized Aldol Products via Michael Addition of Oximes Onto Baylis–Hillman Adducts
摘要:
Triphenylphosphine-catalyzed Michael addition of oximes 2 onto Baylis-Hillman (B-H) adducts 1 led to an easy access to a novel class of oxime functionalized aldol products 3. This demonstrates the first use of an oxygen-centered nucleophile in Michael addition to B-H adducts, without touching any other functional group. Deprotection of oxime in 3 was further demonstrated using molecular hydrogen (1 atm) and 10% Pd/C (cat.) to furnish functionalized 1,3-diols 4 as potentially useful synthons with optional backbone choice (R 3 and EWG).
Porcine Liver Esterase Catalyzed Kinetic Resolution of Baylis-Hillman (B-H) Adducts
摘要:
Esterase from porcine liver smoothly resolves varieties of racemic 2-methylene-3-substituted-3-hydroxypropanoates (B-H adducts) to obtain the corresponding unreacted esters in very good to excellent ee (94 to >99%, seven examples) and hydrolyzed acids in good ee (58-75%). Substitution in B-H adducts, chosen for resolution, are funtionalized phenyl, thiophen-3-yl, cinnamyl, and alkyl groups.
Synthesis of α-methylene-δ-oxo-γ-amino esters via Rh(<scp>ii</scp>)-catalyzed coupling of 1-sulfonyl-1,2,3-triazoles with Morita–Baylis–Hillman adducts
作者:Hyun Ji Jeon、Mi Soo Kwak、Da Jung Jung、Jean Bouffard、Sang-gi Lee
DOI:10.1039/c6ob02086k
日期:——
1-alkynes and sulfonyl azides, with Morita–Baylis–Hillman (MBH) adducts afforded highly functionalized α-methylene-δ-oxo-γ-amino esters in excellent yields with broad functional group tolerance. This transformation can also be successfully accomplished as a multicomponent all-in-one-pot reaction of 1-alkynes, sulfonyl azides and MBH adducts in the presence of Cu(I) and Rh(II) catalysts.
Triphenylphosphine-catalyzed Michael addition of oximes 2 onto Baylis-Hillman (B-H) adducts 1 led to an easy access to a novel class of oxime functionalized aldol products 3. This demonstrates the first use of an oxygen-centered nucleophile in Michael addition to B-H adducts, without touching any other functional group. Deprotection of oxime in 3 was further demonstrated using molecular hydrogen (1 atm) and 10% Pd/C (cat.) to furnish functionalized 1,3-diols 4 as potentially useful synthons with optional backbone choice (R 3 and EWG).
Porcine Liver Esterase Catalyzed Kinetic Resolution of Baylis-Hillman (B-H) Adducts
作者:Debnath Bhuniya、Sanju Narayanan、Taranpreet Singh Lamba、K. V. S. R. Krishna Reddy
DOI:10.1081/scc-120025180
日期:2003.11
Esterase from porcine liver smoothly resolves varieties of racemic 2-methylene-3-substituted-3-hydroxypropanoates (B-H adducts) to obtain the corresponding unreacted esters in very good to excellent ee (94 to >99%, seven examples) and hydrolyzed acids in good ee (58-75%). Substitution in B-H adducts, chosen for resolution, are funtionalized phenyl, thiophen-3-yl, cinnamyl, and alkyl groups.