Nickel-catalyzed, highly diastereoselective annulations between activated allenes and 2-acetylarylboronic acid or 2-formylarylboronic acids are reported. No ligand for nickel is required, and the reactions proceed efficiently at room temperature to give a broad range of substituted 3-methyleneindan-1-ols. Preliminary results of an enantioselective variant are also described.
High exoselectivity in diels-alder additions of α-vinylidene and α-methylene-γ-butyrolactones to cyclopentadiene.
作者:Frédéric Fotiadu、Françoise Michel、Gérard Buono
DOI:10.1016/s0040-4039(00)97753-0
日期:1990.1
or thermal, lactones 1 and 8 undergo kinetically controlled Diels-Alder cycloadditions to cyclopentadiene with pronounced exoselectivity. The activation parameters are reported for both reactions. It is suggested that such exoselectivity is a general property of conformationally rigid cyclic cisoid dienophiles.
Das<i>s-cis-/s-trans</i>-Konformerengleichgewicht bei Allencarbonsäureestern
作者:Robert W. Lang、Hans-Jürgen Hansen
DOI:10.1002/hlca.19800630512
日期:1980.7.9
The s-cis/s-trans Conformational Equilibrium of Allenic Esters
烯丙基酯的s-cis / s-trans构象平衡
Diastereocontrol in intermolecular diels-alder reactions of allenic lactones: Synthetic approach to the plaunols
作者:Michael E. Jung、Craig N. Zimmerman、Gregory T. Lowen、Saeed I. Khan
DOI:10.1016/0040-4039(93)88057-p
日期:1993.7
Diels-Alder cycloaddition of the allenic lactone 11 with 1-(1-(t-butyldimethylsilyloxy)vinyl)cyclohexene 6b produces the desired cycloadduct 12 with good endo selectivity (4:1) and excellent diastereoselectivity.
FOTIADU, FREDERIC;ARCHAVLIS, ALBERT;BUONO, GERARD, TETRAHEDRON LETT., 31,(1990) N4, C. 4859-4862