The neuromuscular blocking activity of some monoquaternary androstane derivatives

The neuromuscular blocking activity of some 3- or 17-monoquaternary derivatives of 3β,17β-dipyrrolidin-1′-yl-5α-androstane has been examined in the cat. 3-Monoquaternary salts were, in general, more potent than the 17-monoquaternary salts. It was concluded that the presence of a quaternary group in position 3 is an important determinant of potency in this series of androstane derivatives.

The chemistry of 2,1-benzisothiazoles. IV. The preparation of 3-substituted 2,1-benzisothiazoles

Eight 3-substituted 2,1-benzisothiazoles have been prepared from 3- amino-2,1-benzisothiazole (2; R = NH2) by diazotization and replacement of the diazonium group. Acylation of 3-amino-2,1-benzisothiazole in the presence of base yielded N,N?-diacyl derivatives of the 3-imino tautomer.

Neuromuscular blocking agents. Replacement of quaternary ammonium groups in bis-onium compounds by amidinium, guanidinium, thiouronium, sulphonium and sulphoxonium groups

The quaternary ammonium groups of suxamethonium have been replaced by amidinium, guanidinium and thiouronium groups. The guanidine compound exhibited competitive neuromuscular activity of a low order of potency; the other compounds were ineffective. Replacement of the quaternary ammonium groups in decamethonium by ethylmethylsulphonium or dimethylsulphoxonium groups gave less potent, depolarizing agents.

Chemical stimulation of the midbrain reticular system

An intracerebral cannula system was surgically implanted in each of 21 rats. The responses of each S were observed following the temporary deposition of acetylcholine chloride, sodium pentothal, 1-epinephrine, or the placement of a blank cannula. Acetylcholine produced drinking in the hypothalamus and stereotyped standing postures in the reticular system Ss. Sodium pentothal produced an increment in feeding responses in the ventrolateral-reticular-system Ss and an increment in grooming in the dorsomedial-reticular-system Ss.