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2005
Multicomponent reactions
O 0359
Nickel-Catalyzed Addition of Dimethylzinc to Aldehydes Across Alkynes and
An Efficient Four-Component Connection Reaction. — Using this
21- 070 1,3-Butadiene:
method a wide range of octadienols of type (V) are available. Unfortunately, almost no
regioselectivity is observed starting from unsymmetrical alkynes. The reaction of isoprene gives a mixture of (E)- and (Z)-isomers. An intramolecular version of this coupling is also possible to give various alkylidene substituted 5- and 6-membered ring
systems with a high level of 1,5-diastereoselectivity. In contrast, 7- and 8-membered
ring systems are not formed under these conditions (to be continued). — (KIMURA,
M.; EZOE, A.; MORI, M.; TAMARU*, Y.; J. Am. Chem. Soc. 127 (2005) 1, 201-pp;
Dep. Appl. Chem., Fac. Eng., Nagasaki Univ., Bunkyo, Nagasaki 852, Japan; Eng.)
— Jannicke
2005
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