Origins of the regioselectivities in the Diels-Alder reactions of vinylindenes with 1,4-quinone monoketal and acrolein dienophiles.
Computations with density functional theory (B3LYP/6-31G(d)) have elucidated the origins of regioselectivities in the Diels-Alder reaction of vinylindene with a 1,4-quinone monoketal reaction that was employed as the key step in the synthesis of fluostatin C. Frontier Molecular Orbital theory and an electrostatic model are applied to the reactions of alkyl-substituted and vinylindene dienes with 1,4-quinone monoketal and acrolein dienophiles. Regiochemical results that deviate from expectation are explained by a progression from electronic to steric control upon the addition of a Lewis acid catalyst.
Hayden
Amy E
AE
Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive, Los Angeles, California 90095-1569, USA.
DeChancie
Jason
J
George
Alexander H
AH
Dai
Mingji
M
Yu
Maolin
M
Danishefsky
Samuel J
SJ
Houk
K N
KN
D000143:Acids / Q000737:chemistry; D000171:Acrolein / Q000737:chemistry*; D002384:Catalysis; D002625:Chemistry, Organic / Q000379:methods*; D005449:Fluorenes / Q000737:chemistry; D007192:Indenes / Q000737:chemistry*; D008956:Models, Chemical; D008968:Molecular Conformation; D015394:Molecular Structure; D011809:Quinones / Q000737:chemistry*; D055672:Static Electricity; D013816:Thermodynamics; D014753:Vinyl Compounds / Q000737:chemistry*
D000143:Acids; D005449:Fluorenes; D007192:Indenes; D011809:Quinones; D014753:Vinyl Compounds; C512873:fluostatin C; C545570:vinylindene; D000171:Acrolein