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By El Sayed H. El Ashry and Ahmed A. Kassem

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ZnCl, > (s) (via B) H CI > Br. O^s) LiDBEt Ph K H 1. LiCHBr, 2. ZnCl, D H NaN 3 (via B) H NH, > H N3 0^(S) 1. NaCIO, (oxidant) CO,H D H 2. H,/Pd D H H CI H 1. LiCHCl 1 2. 4. C. K. (1983). Asymmetric hydroboration. In Asymmetric synthesis (ed. D. Morrison), Vol. 2, pp 1-43. Academic Press, Orlando, Florida. , and Zaidlewicz, M. (1982). Organoborane compounds in organic synthesis. In Comprehensive organometallic chemistry (ed. G. A. W. 7, pp 111-363. Pergamon Press, Oxford. R. (1982) Stereoselective aldol condensations.

3). OSiEt 3 Et 3 SiH cat. 4). 5). 5) FSiMe, The enolate anions are more reactive towards electrophiles when they are associated with non-coordinating quaternary ammonium cations than when they are associated with lithium cations. 5, quaternary ammonium derivatives are preferred as counterions for kinetic enolates in order to prevent any isomerization to the thermodynamic enolate occurring before reaction with the added electrophile proceeds. 3. SiMe, c J O Nil E1" enolate ,

3). OSiEt 3 Et 3 SiH cat. 4). 5). 5) FSiMe, The enolate anions are more reactive towards electrophiles when they are associated with non-coordinating quaternary ammonium cations than when they are associated with lithium cations. 5, quaternary ammonium derivatives are preferred as counterions for kinetic enolates in order to prevent any isomerization to the thermodynamic enolate occurring before reaction with the added electrophile proceeds. 3. SiMe, c J O Nil E1" enolate ,

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Account of microwave irradiation for accelerating organic reactions by El Sayed H. El Ashry and Ahmed A. Kassem


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