Rule 15 has no application where a judge in the trial court denies a defendant’s motion to dismiss in a criminal case. Rule 15 (a) (1) applies when a judge allows a defendant’s motion to dismiss; the rule recognizes the Commonwealth’s right to appeal in that situation. Rule 15 (a) (2) does not apply to rulings on motions to dismiss. There simply is no mechanism in Rule 15 for a defendant whose motion to dismiss has been denied to seek leave to pursue an interlocutory appeal from that ruling.1
*1003Chukwuma E. Azubuko, pro se.
Nor was Azubuko entitled to relief from the single justice under G. L. c. 211, § 3. “The denial of a motion to dismiss in a criminal case is not appealable until after trial, and we have indicated many times that G. L. c. 211, § 3, may not be used to circumvent that rule. Unless a single justice decides the matter on the merits or reserves and reports it to the full court, neither of which occurred here, a defendant cannot receive review under G. L. c. 211, § 3, from the denial of his motion to dismiss.” Jackson v. Commonwealth, 437 Mass. 1008, 1009 (2002), and cases cited. The only exception we have recognized is where a defendant’s motion to dismiss raises a double jeopardy claim of substantial merit. Id. To that end, we allow the defendant to obtain review of the claim on the merits before trial. Id., citing Neverson v. Commonwealth, 406 Mass. 174, 175-176 (1989). Nothing in Azubuko’s convoluted submission to the single justice remotely suggested the assertion of a double jeopardy claim having substantial merit. The single justice was thus correct to deny extraordinary relief under G. L. c. 211, § 3, in these circumstances.
Judgment affirmed.