1967
DOI: 10.1021/jo01279a087
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A facile cyclization of 4-(2-chloroethyl)-3-methyl-2- pyrazolin-5-one to a spirocyclopropane derivative

Abstract: NOTES 1229 limation gave an analytical sample, mp 49-50.5'. The infrared spectrum (neat) showed absorption a t 3300 cm-' (OH); the nmr spectrum (CDCla) showed doublets a t 7 2.70 and 3. 21 (1 H doublets, J = 5 cps, aromatic), a broad absorption a t 4.70-4. 93 (1 H, OH), and a complex multiplet a t 6.80-8.00 ( 5 H, aliphatic ring hydrogens).Anal. Calcd for C7H80S: C, 59.97; H, 5.75; S, 22.87.(4) Melting points were determined on a calibrated Fisher-Johns apparatus and are corrected. Elemental analyses were p… Show more

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Cited by 7 publications
(2 citation statements)
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“…The reaction is reversed on heating the spirane in concentrated hydrochloric acid. 38 In the second example in Scheme 18, cyclization with five-membered-ring formation is effected by oxidative bond formation between two appropriately placed amino nitrogens, from an oxime and an amide function in a cy- reaction path…”
Section: Scheme 17mentioning
confidence: 99%
“…The reaction is reversed on heating the spirane in concentrated hydrochloric acid. 38 In the second example in Scheme 18, cyclization with five-membered-ring formation is effected by oxidative bond formation between two appropriately placed amino nitrogens, from an oxime and an amide function in a cy- reaction path…”
Section: Scheme 17mentioning
confidence: 99%
“…Acyl-lactone und -thiollactone liefern mit Abfangbasen, die zwei nucleophile Zentren besitzen, unter doppelter Kondensation heterocyclische Verbindungen [17][18][19][20] . Abfangreaktionen mit Guanidin, Acetamidin und Phenylhydrazin liefern im vorliegenden Falle 2-Amino-6-hydroxy-4-phenyl-5-or/Äo-mercaptobenzyl-(VII a) und 6-Hydroxy-2-methyl-4-phenyl-5-orZÄo-mercapto-benzyl-pyrimidin (VII b) sowie 1.3-Diphenyl-4-orfAo-mercapto-benzyl-pyrazolon-(5) (VIII) als weiße, auf Grund ihrer Polarität in den gebräuchlichen Lösungsmitteln unlösliche Feststoffe: mit in Übereinstimmung mit bekannten Werten 21 23 .…”
Section: Abfangreaktionen Am 3-benzoyl-34-dihydro-l-thiocumarinunclassified