Abstract The cobalt-mediated (2+ 2+ 2) cycloaddition of bis (trimethylsilyl) acetylene
(BTMSA) to various alkynyl-appended benzofurans was investigated as a means of …

The ability of $\eta\sp5 $-cyclopentadienyl cobalt complexes to effect formal (2+ 2+ 2)-
cycloaddition of two alkyne moieties to the pyrrole nucleus was investigated. CpCo …

An attempt has been made to establish the synthetic utility of cycloaddition reactions
involving the oxyallyl cation [graphic omitted]. Reactions of this intermediate (R1, R3= alkyl; …

Regiospecific and Stereoselective Syntheses of (±) Morphine, Codeine, and Thebaine via a
Highly Stereocontrolled Intramolecular 4 + 2 Cycloaddition Leading to a Phenanthrofuran …

A recentlydeveloped procedure for the preparation of trimethylsilylated isobenzofurans and
the use of these materials in cycloaddition reactions has been extended to an …

Morphine (1) continues to occupy a position of unique clinical importance in medicine, its
wide prescription for the treatment of severe pain and for relief of suffering in the terminally ill …

Stereoselective Cobalt-Mediated [2+2+2]Cycloadditions to the Benzofuran Nucleus: A
Novel Strategy Towards the Synthesis of Morph Page 1 306 LETTER Synlett 2000, No. 3 …

2-Oxyallylic cationshave been generated by two new routes:(1) a heterocyclic one starting
with the highly reactive 2-dimethylamino-4-methylene-1, 3-dioxolanes 4a, 4b, and 5, and (2) …

Background. A. Syntheses of morphine................................. 2 Mechanism of the Fischer indole
reaction.............. 8 Statement of the problem...................................... 13 Discussion …

Cycloheptane derivatives are found in a wide range of natural products, 1 and various
synthetic methods of these compounds have been explored. 2 From the viewpoint of …